Simple Nature - Light and Matter

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.0.8 Notation and unitsquantity unit symboldistance meter, m x, ∆xtime second, s t, ∆tmass kilogram, kg mdensity kg/m 3 ρforce newton, 1 N=1 kg·m/s 2 Fvelocity m/s vacceleration m/s 2 agravitational field J/kg·m or m/s 2 genergy joule, J E (also electric field)momentum kg·m/s pangular momentum kg·m 2 /s or J·s L (also inductance)power watt, 1 W = 1 J/s P (also pressure)pressure 1 Pa=1 N/m 2 P (also power)temperature K T (also period)period s T (also temperature)wavelength m λfrequency s −1 or Hz fcharge coulomb, C qvoltage volt, 1 V = 1 J/C Vcurrent ampere, 1 A = 1 C/s Iresistance ohm, 1 Ω = 1 V/A Rcapacitance farad, 1 F = 1 C/V Cinductance henry, 1 H = 1 V·s/A L (also angular momentum)electric field V/m or N/C E (also energy)magnetic field tesla, 1 T = 1 N·s/C·m Bfocal length m fmagnification unitless Mindex of refraction unitless nelectron wavefunction m −3/2 Ψ.0.9 Fundamental constantsgravitational constant G = 6.67 × 10 −11 J·m/kg 2Boltzmann constant k = 1.38 × 10 −23 J/KCoulomb constant k = 8.99 × 10 9 J·m/C 2 or N·m 2 /C 2quantum of charge e = 1.60 × 10 −19 Cspeed of light c = 3.00 × 10 8 m/sPlanck’s constant h = 6.63 × 10 −34 J·sNote the use of the same notation, k, for both the Boltzmann constant and the Coulombconstant.942 Chapter Appendix 5: Useful Data
.0.10 Metric prefixesM- mega- 10 6k- kilo- 10 3m- milli- 10 −3µ- (Greek mu) micro- 10 −6n- nano- 10 −9p- pico- 10 −12f- femto- 10 −15Note that the exponents go in steps of three. The exception is centi-, 10 −2 , which is used onlyin the centimeter, and this doesn’t require memorization, because a cent is 10 −2 dollars..0.11 Nonmetric unitsNonmetric units in terms of metric ones:1 inch = 25.4 mm (by definition)1 pound (lb) = 4.5 newtons of force1 scientific calorie = 4.18 J1 nutritional calorie = 4.18 × 10 3 J1 gallon = 3.78 × 10 3 cm 31 horsepower = 746 WThe pound is a unit of force, so it converts to newtons, not kilograms. A one-kilogram mass atthe earth’s surface experiences a gravitational force of (1 kg)(9.8 m/s 2 ) = 9.8 N = 2.2 lb. Thenutritional information on food packaging typically gives energies in units of calories, but thoseso-called calories are really kilocalories.Relationships among U.S. units:1 foot (ft) = 12 inches1 yard (yd) = 3 feet1 mile (mi) = 5280 feet1 ounce (oz) = 1/16 pound.0.12 The Greek alphabetα A alpha ι I iota ρ P rhoβ B beta κ K kappa σ Σ sigmaγ Γ gamma λ Λ lambda τ T tauδ ∆ delta µ M mu υ Y upsilonɛ E epsilon ν N nu φ Φ phiζ Z zeta ξ Ξ xi χ X chiη H eta o O omicron ψ Ψ psiθ Θ theta π Π pi ω Ω omega.0.13 Subatomic particlesparticle mass (kg) charge radius (fm)electron 9.109 × 10 −31 −e 0.01proton 1.673 × 10 −27 +e ∼ 1.1neutron 1.675 × 10 −27 0 ∼ 1.1neutrino ∼ 10 −39 kg ? 0 ?The radii of protons and neutrons can only be given approximately, since they have fuzzy943
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Fullerton, Californiawww.lightandma
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Contents0 Introduction and Review0.
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5.5 More About Heat Engines . . . .
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669.11.3 Magnetic Fields by Ampère
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The Mars Climate Orbiter is prepare
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temperatures and with many combinat
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idence that quarks have smaller par
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give clearer explanations.Finally,
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It can also be handy to have a rela
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The prefix centi-, meaning 10 −2
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goes like this:V = 1 3 Ah[1]A = πr
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the notation 10 0 to stand for one,
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calculation, 5.04 cm, was really no
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0.2 Scaling and Order-of-Magnitude
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to many times your own height. The
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g / 1. This plank is as long as it
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the front panels of the three violi
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Correct solution #4: The area of a
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here?” The scientific Mr. Spock w
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1. Don’t even attempt more than o
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Problem 10.mean, however, is define
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(d) Find the person’s acceleratio
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Albert Einstein, and his moustache,
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54 Chapter 0 Introduction and Revie
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a / Portrait of Monsieur Lavoisiera
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1.1.1 Problem-solving techniquesHow
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∆m = 0, where m is the total mass
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different substances will have diff
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c / Left: In a frame of referenceth
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f / Discussion question B.(discusse
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Self-check D.since the derivative o
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ProblemsThe symbols √ , , etc. ar
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difficult? ⊲ Solution, p. 932Key
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Heat energy can be convertedto ligh
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a new form of invisible “mystery
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f / A realistic drawing of Joule’
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numbers. With a purely numerical ap
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of gravity doesn’t change much if
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field. If the plane can start from
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m / Discussion question C.n / A hyd
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88 Chapter 2 Conservation of Energy
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A car drives over a cliff.new frame
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How long does it take to move 1 met
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a / Approximations to thebrachistoc
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a / An ellipse is circle that hasbe
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to deduce the general equation for
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to the mass of the object that inte
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The minimum velocity required for t
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and since sin θ dθ occurs in the
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that is deeper than r. Under the as
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2.3.6 ⋆ Evidence for repulsive gr
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a / A vivid demonstration thatheat
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ture. This is a very good question,
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Three functions with thesame curvat
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This looks like a cosine function,
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Problem 16.13 Anya and Ivan lean ov
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Problem 27.then we’d have U/m =
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37 Two springs with spring constant
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ExercisesExercise 2A: Reasoning wit
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128 Chapter 2 Conservation of Energ
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3.1 Momentum In One Dimensiona / Sy
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eing to the right. The initial mome
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3.1.3 Momentum compared to kinetic
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3.1.4 Collisions in one dimensiong
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could never do that again in a mill
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i / The highjumper’s body passeso
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where x 1 is the mass of the first
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3.1.6 The center of mass frame of r
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The airbag increases ∆tso as to r
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d / Two magnets exert forceson each
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x (m) t (s)10 1.8420 2.8630 3.8040
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3.2.4 Forces between solidsConserva
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Maximum acceleration of a car examp
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Discussion QuestionA Criticize the
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C A pool ball is rebounding from th
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forces, as if the hand were a pair
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This may not sound like an impressi
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stroke are both executed in straigh
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Accelerating a cart example 35If yo
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w / A wedge.x / Archimedes’ screw
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As in the preceding example, we hav
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that have the same frequency is a s
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around until I got this result, sin
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quality factor, Q, is defined as Q
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ight direction to add energy to the
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i / Example 45: a viola withouta mu
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Collapse of the Nimitz Freeway exam
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end up canceling out, however:Q =
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186 Chapter 3 Conservation of Momen
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c / Bullets are dropped and shot at
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the asteroid’s energy and boostin
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coordinate axes. Even though ∆x,
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of the three components,∆p x = 0
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A useless vector operation example
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Solving for the unknowns gives∆x
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o / Example 64.p / Adding vectors g
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How to generalize one-dimensional e
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needed to support the object in fig
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The easiest method is the one demon
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Incorrect solution #4:(same notatio
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The magnitude of the acceleration i
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dropped out like a trap door, showi
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af / Breaking trail, by WalterE. Bo
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know how to integrate with respect
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Problem 16.Problem 19.resistance.)1
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of gravity on Mars.(a) Find the tim
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partner force. (a) A swimmer speeds
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Problem 45the 0.4-gram masses would
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53 If you walk 35 km at an angle 25
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(b) Interpret this equation in the
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Problem 71.232 Chapter 3 Conservati
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77 A car accelerates from rest. At
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Problem 81.81 Complete example 71 o
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ExercisesExercise 3A: Force and Mot
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Exercise 3C: Worksheet on Resonance
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Exercise 3D: Vectors and MotionEach
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244 Chapter 3 Conservation of Momen
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An overhead view of apiece of putty
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inward toward the hinge will have n
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special case, we can choose to visu
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j / Two asteroids collide.k / Every
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Note that although the factors of 2
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Relationship between force and torq
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is straight down, which is perpendi
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⊲ All three objects in the figure
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aa / Example 10.to either side of e
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momentum tells us that L = mrv sin
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In the absence of any torque, a rig
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Radial acceleration at the surface
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The parallel axis theorem example 1
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differential. The result isarea ===
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of inertia as if the object was smo
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h / Moments of inertia of somegeome
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4.3 Angular Momentum In Three Dimen
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14 deg, and it points along an axis
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manner like this, then the definiti
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k / Example 27.torque to the left w
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We can also generalize the plane-ro
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Problem 1.Problem 6.Problem 8.Probl
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14 (a) The bar of mass m is attache
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Problem 22.22 The sun turns on its
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35 The nucleus 168 Er (erbium-168)
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ExercisesExercise 4A: TorqueEquipme
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pesky set of constraints on heat en
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mit more air into the cavity behind
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Pressure of lava underneath a volca
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h / A simplified version of anideal
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for us to construct a simple connec
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For the first time we have an inter
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a / 1. The temperature differencebe
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Carnot engines operating between a
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from A to B, he lets it by, but whe
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B When we run the Carnot engine in
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f / A phase space for a singleatom
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time, the energy sharing is very un
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will the the one that maximizes the
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If the gas is monoatomic, then we k
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5.4.4 The arrow of time, or “this
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5.4.6 Summary of the laws of thermo
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may be in the form of microscopic d
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significant amount of heat to flow
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while the smaller area under the bo
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7 (a) Determine the ratio between t
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338 Chapter 5 Thermodynamics
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end of this book, we’ll even see
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c / As the wave pattern passes the
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the wave move ahead faster and get
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k / Hitting a key on a pianocauses
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Our final result for the speed of t
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care, because the delay is the same
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An easy way to visualize this is in
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can be constructed as a superpositi
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⊲ Looking up the speed of light i
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scientists, to speak of the Big Ban
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6.2 Bounded WavesSpeech is what sep
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d / An uninverted reflection. There
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our intuitive expectation of strong
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valid solutions. In the following s
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j / In the mirror image, theareas o
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m / A pulse bounces backand forth.i
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q / Graphs of loudness versusfreque
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s / Standing waves on a rope. (PSSC
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“cavity” and “neck” parts o
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Problem 5.Problem 8.5 The figure sh
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Problem 16.16 A Fabry-Perot interfe
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c / Newton’s laws do not distingu
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f / The correspondence principlereq
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d / A Galilean version of therelati
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g / Three types of transformations
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system, velocities are always unitl
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p / Apparatus used for the testof r
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sumption, the assumption that it ma
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at rest relative to the water. But
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7.2.4 No action at a distanceThe Ne
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so that Alice can complete her moti
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time into different regions accordi
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position relative to the sun at exa
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7.2.7 ⋆ Four-vectors and the inne
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would depend on the relative veloci
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7.3 DynamicsSo far we have said not
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In this frame, as expected, the sma
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But this whole argument was based o
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meters per second, so converting to
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Expressing γ as ( 1 − v 2 /c 2)
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7.3.4 ⋆ ProofsThis optional secti
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these lines. For example, a car sit
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An Einstein’s ring. Thedistant ob
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two-dimensional universe as if it w
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h / 1. A ray of light is emittedupw
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object that that isn’t influenced
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it impossible for any observer to b
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a variant on the Penrose singularit
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in it. Instead, it is currently spe
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2 Astronauts in three different spa
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(d) Simplify your answer to part c
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Problem 25b. Redrawn fromVan Baak,
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ExercisesExercise 7A: The Michelson
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Exercise 7B: Sports in Slowlightlan
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448 Chapter 7 Relativity
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Exercise 7D: Misconceptions about R
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452 Chapter 7 Relativity
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sun, moon, stars, and planets were
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Two types of chargeWe can easily co
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the other acquires an equal amount
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to get the beam up to speed in the
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telling us that we know about matte
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the muddle. The row-and-column sche
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the force of air friction canceled
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ectly evaluate the implications of
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that they were indeed electrically
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C Thomson found that the m/q of an
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the object with a net positive char
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thickness of material the radioacti
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It was already known that although
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particle. It turned out that it was
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For example they could easily strip
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cording to Mosely, the atomic numbe
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that fly off to see what was inside
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solution was found by measuring the
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o / A nuclear power plant at Catten
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neutrons. In a nuclear fission bomb
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We can now list all four of the kno
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1. Our sun’s source of energy is
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a / The known nuclei, represented o
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killed, because the DNA becomes una
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e / Wild Przewalski’s horsesprosp
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Problem 1. Top: A realisticpicture
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12 The subatomic particles called m
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ExercisesExercise 8A: Nuclear decay
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saxophone, every technological tool
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Example 1Ions moving across a cell
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ut the original meaning was to trav
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Force depends only on position. Sin
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Here are a few questions and answer
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flow through it.For many substances
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superconductivity in metals that wo
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j / Example 9. In 1 and 2,charges t
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look like the usual resistor. The f
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9.1.5 Current-conducting properties
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attery acid becomes depleted of hyd
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9.2 Parallel and Series CircuitsIn
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to each resistance, resulting inI t
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where “...” means that the sum
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the two resistors in figure h/3.We
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Choice of high voltage for power li
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A complicated circuit example 20⊲
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Problem 2.ProblemsThe symbols √ ,
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Problem 16.only count that as one u
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knob turned all the way clockwise,
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A printed circuit board, likethe ki
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ExercisesExercise 9A: Voltage and C
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Exercise 9C: Reasoning About Circui
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556 Chapter 9 Circuits
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a / A bar magnet’s atoms are(part
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defined. The ship’s captain can m
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Reduction in gravity on Io due to J
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j / Example 3.self-check AFind an e
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a dipole moment — they are define
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10.2.1 One dimensionVoltage is elec
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The interpretation is that if you b
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Figure c shows some examples of way
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For large values of d, this express
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where Q is the total charge of the
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g / Example 12: variation of the fi
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corners to the disk and transform i
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10.4 Energy In Fieldsa / Two opposi
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self-check DWe can think of the qua
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of the inward field contributed by
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space, 2 while charge doesn’t, we
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a / The symbol for a capacitor.b /
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ounding each capacitor will be half
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in time:x ↔ qv ↔ Iself-check GH
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due to its own momentum. It perform
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or|V | =∣ LdIdt ∣ ,which in man
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the inductor resists such a sudden
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Example 26.Death by solenoid; spark
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ordering.( 1 √2+√ i ) 2 = √ 1
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x / The complex number e iφlies on
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Figure aa shows a useful way to vis
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Inductors tend to be big, heavy, ex
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The reason for using the trig ident
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a purely inductive or capacitive lo
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Resonance with damping example 33
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orE outward, on side 1 A + E outwar
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|E| = kq totalr 2 ,where r is the r
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y considering its point charges ind
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Discussion Questionsg / Discussion
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with charge, change the Coulomb con
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The symmetry between the two sides
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where dv is the volume of the cube.
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The three terms in the divergence a
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Problem 19.Problem 20.proton, for e
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the lightning strike.(b) Based on y
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units.(b) Verify that RC has units
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lating freely (without any driving
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ExercisesExercise 10A: Field Vector
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5. Now hook up the two solenoids in
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A large current is createdby shorti
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time I used it implicitly was in fi
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f / A standard dipole madefrom a sq
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and substituting q = λh and v = m/
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o / Magnetic forces cause abeam of
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electric field, a magnetic one, can
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u / In this scene from SwanLake, th
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so the total field in the z directi
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For the y component, we havee / A s
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We can pin down the result even mor
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i / The field of a dipole.where r i
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circulates around the y axis, so at
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to be, not where it is now. Coulomb
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We have found one specific example
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to a flagpole, we can cancel out a
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11.4 Ampère’s Law In Differentia
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y evaluating the field at the midpo
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i.e.,F = axˆx + byˆx + cˆx + dx
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k / A summary of the derivative, gr
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c / Detail from Ascending andDescen
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the magnet. Are these atomic curren
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field in her region of space has be
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A changing magnetic flux makes a cu
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nearly zero. By Faraday’s law, th
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c / An Ampèrian surface superimpos
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and Maxwell’s equations becomeΦ
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k / Red and blue light travelat the
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second, the zero-point is located a
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is the magnitude of the momentum ve
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Discussion question A.Discussion qu
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only penetrates to a very small dep
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elationship D = ɛE would actually
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esulting in cancellation.The opposi
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a low permeability, while the other
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n / A fluxgate compass.is externall
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6 Two parallel wires of length L ca
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an instant at the upper right, but
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Problem 25.20 Four long wires are a
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Problem 35.Problem 37.32 Verify Amp
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Problem 42.beam of light usually co
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(c) Discuss the relationship betwee
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(f) Use conservation of energy to r
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5. Now position yourself with your
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12.1.1 The nature of lightThe cause
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An image of Jupiter andits moon Io
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d / Two self-portraits of theauthor
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ultimate truth about light, but the
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• There is a tendency to conceptu
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self-check AEach of these diagrams
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m / Discussion question B.Discussio
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12.2 Images by ReflectionInfants ar
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Discussion QuestionA The figure sho
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down magnification is AB/DE. A repe
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i / A Newtonian telescopebeing used
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B Locate the images formed by two p
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12.3 Images, QuantitativelyIt sound
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⊲ The object and image angles are
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12.3.2 Other cases with curved mirr
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signs also have to be memorized for
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h / A diverging mirror in the shape
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j / Spherical mirrors are thecheape
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general type of eye that we share w
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shown on this graph and then attemp
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the mechanical model would predict
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that your calculator will flash an
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D Classify the examples shown in fi
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12.4.6 ⋆ Microscopic description
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12.5 Wave OpticsElectron microscope
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of a crystal? Sound waves are used
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j / Thomas Youngk / Double-slit dif
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object that diffracts it, so the tr
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Although the equation λ/d = sin θ
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things we’ve learned about diffra
Page 794 and 795:
apidly changing distances; on reuni
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6 The figure on the next page shows
Page 798 and 799:
14 Here’s a game my kids like to
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27 Suppose a converging lens is con
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same depth, but not quite. [Check:
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Problem 42.42 Panel 1 of the figure
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46 The figure below shows two diffr
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53 The beam of a laser passes throu
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Problem 59.the ancient problem of i
Page 812 and 813:
3. Now imagine the following new si
Page 814 and 815:
Exercise 12B: Object and Image Dist
Page 816 and 817:
Exercise 12D: Double-Source Interfe
Page 818 and 819:
Exercise 12E: Single-slit diffracti
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Exercise 12F: Diffraction of LightE
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energy, instead of being spread out
Page 824 and 825:
correlated. If they have been playi
Page 826 and 827:
small.The statement that the rule f
Page 828 and 829:
But the y axis can no longer be a u
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for a long time once it gets there,
Page 832 and 833:
j / Calibration of the 14 C dating
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given by(probability of a ≤ x ≤
Page 836 and 837:
k / In recent decades, a huge hole
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A wave is partially absorbed.c / A
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f / The hamster in her hamsterball
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How would you extract h from the gr
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F Does E = hf imply that a photon c
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of approaching this issue.)j / Bull
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We assume v is small enough so that
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the probability distribution will b
Page 852 and 853:
trons that we have already used for
Page 854 and 855:
equations of general validity are t
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wave carries high probability and w
Page 858 and 859:
An infinite sine wave can only tell
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momentum implies a definite kinetic
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of snapshots would amount to a desc
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close are the electrons to the limi
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dimensional particle in a box, and
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Applying this to conservation of en
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the probability of making it throug
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Three dimensionsFor simplicity, we
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1. Oscillations can go backand fort
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C The figure shows a skateboarder t
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a / Eight wavelengths fit aroundthi
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As shown by these examples, the unc
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e / The three states of the hydroge
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f / The energy levels of a particle
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∂r/∂x = x/r comes in handy. Com
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50% of its time in each atom. It’
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tus to the z axis) and more memorab
Page 892 and 893: ut why does that have anything to d
Page 894 and 895: the data are only inaccurate due to
Page 896 and 897: 14 The photoelectric effect can occ
Page 898 and 899: Problem 25.(b) Sketch a graph showi
Page 900 and 901: conservation of energy and momentum
Page 902 and 903: Problem 43.43 On pp. 884-885 of sub
Page 904 and 905: ExercisesExercise 13A: Quantum Vers
Page 906 and 907: ⊲ First we convert the equation i
Page 908 and 909: Programming With PythonThe purpose
Page 910 and 911: Appendix 2: MiscellanyUnphysical
Page 912 and 913: 18 bestt = t19 c1 = bestc120 c2 = b
Page 914 and 915: p i + ∑ iThe spin theoremTheorem:
Page 916 and 917: Appendix 3: Photo CreditsExcept as
Page 918 and 919: Appendix 4: Hints and SolutionsHint
Page 920 and 921: Hints for Chapter 6Page 377, proble
Page 922 and 923: Answers to Self-Checks for Chapter
Page 924 and 925: Page 301: (1) Not valid. The equati
Page 926 and 927: Page 584:N −1 m −2 C 2 V 2 m
Page 928 and 929: the dashed ray.Page 748: You should
Page 930 and 931: direction it was initially going (i
Page 932 and 933: Page 52, problem 38: The cone of mi
Page 934 and 935: Page 224, problem 37: (a) Spring co
Page 936 and 937: object, we have static friction, wh
Page 938 and 939: Page 549, problem 29:(a) Conservati
Page 940 and 941: Page 798, problem 19: (a) The objec
Page 944 and 945: surfaces. For comparison, a typical
Page 946 and 947: elations:a = ∆v∆tx = 1 2 at2 +
Page 948 and 949: we are moving along with the projec
Page 950 and 951: the number of oscillations required
Page 952 and 953: In general, the cross product of ve
Page 954 and 955: Sound waves consist of increases an
Page 956 and 957: signs for charge is that with this
Page 958 and 959: know that there is a delay in time
Page 960 and 961: is related byΦ = 4πkq into the ch
Page 962 and 963: to use sophisticated models such as
Page 964 and 965: Chapter 13, Quantum Physics, page 8
Page 966 and 967: oth position and momentum, the Heis
Page 968 and 969: Schrödinger’s, 864cathode rays,
Page 970 and 971: unstable, 87equipartition theorem,
Page 972 and 973: Joule, James, 73paddlewheel experim
Page 974 and 975: Einstein’s early theory, 838energ
Page 976 and 977: Nikola, 178tesla (unit), 652thermal
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Simple Nature - Light and Matter

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