Introduction to SAT II Physics - FreeExamPapers

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A piano mover pushes on a piano with a force of 100 N, moving it 9 m in 12 s. With how much power does the piano mover push? Power is a measure of the amount of work done in a given time period. First we need to calculate how much work the piano mover does, and then we divide that quantity by the amount of time the work takes. Be careful not to confuse the symbol for watts, W, with the symbol for work, W. Instantaneous Power Sometimes we may want to know the instantaneous power of an engine or person, the amount of power output by that person at any given instant. In such cases, there is no value for to draw upon. However, when a steady force is applied to an object, the change in the amount of work done on the object is the product of the force and the change in that object’s displacement. Bearing this in mind, we can express power in terms of force and velocity: Key Formulas Work Work Done by Gravity Kinetic Energy Work- Energy Theorem Potential Energy Gravitational Potential Energy 84
Mechanical Energy Average Power Instantaneou s Power Practice Questions 1. . How much work does a person do in pushing a box with a force of 10 N over a distance of 4.0 m in the direction of the force? (A) 0.4 J (B) 4.0 J (C) 40 J (D) 400 J (E) 4000 J 2. . A person pushes a 10 kg box at a constant velocity over a distance of 4 m. The coefficient of kinetic friction between the box and the floor is 0.3. How much work does the person do in pushing the box? (A) 12 J (B) 40 J (C) 75 J (D) 120 J (E) 400 J 3. . How much work does the force of gravity do in pulling a 10 kg box down a 30Âº inclined plane of length 8.0 m? Note that sin 30 = cos 60 = 0.500 and cos 30 = sin 60 = 0.866. (A) 40 J (B) 69 J (C) 400 J (D) 690 J (E) 800 J 4. . How much work does a person do in pushing a box with a force of 20 N over a distance of 8.0 m in the direction of the force? (A) 1.6 J (B) 16 J (C) 160 J (D) 1600 J (E) 16000 J 85
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SATII PHYSICS (FROM SPARKNOTES.COM)
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The Good • Because SAT II Subject
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Which SAT II Subject Tests to Take
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After grumbling, however, you still
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Waves 15-19% 11-15 Waves 10% 7-8 Op
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negative, so E, and not A, is the c
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including them anyway because it’
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Two positively charged particles, o
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will a visual representation reliev
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Physics Hint 6: Be Flexible Knowing
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There are a number of ways to label
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Adding Parallel Vectors If the vect
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The result of multiplying A by c is
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neither parallel nor perpendicular.
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Suppose the hands on a clock are ve
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Vector Addition Practice Questions
Page 33 and 34: 2. A The vector 2A has a magnitude
Page 35 and 36: path, Alan has traveled a much grea
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Page 39 and 40: centimeters to the left of its star
Page 41 and 42: We can learn two things about the a
Page 43 and 44: Acceleration vs. Time Graphs After
Page 45 and 46: The variable represents the object
Page 47 and 48: Note that there are certain conveni
Page 49 and 50: 1. . An athlete runs four laps of a
Page 51 and 52: 10. . A woman runs 40 m to the nort
Page 53 and 54: We know the total distance the spri
Page 55 and 56: Principles of Natural Philosophy. I
Page 57 and 58: The component form of Newton’s Se
Page 59 and 60: e in the direction. And since the s
Page 61 and 62: which reflects its resistance to be
Page 63 and 64: In the diagram above, the weight an
Page 65 and 66: A student pushes a box that weighs
Page 67 and 68: 1. . Each of the figures below show
Page 69 and 70: 7. . In the figure above, a person
Page 71 and 72: Since the block is motionless, the
Page 73 and 74: When we are told that a person push
Page 75 and 76: EXAMPLE A water balloon of mass m i
Page 77 and 78: The graph above plots the force exe
Page 79 and 80: Though energy is always measured in
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Page 83: smallest. The answer to question 3
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Page 89 and 90: 8. C When the book reaches the pers
Page 91 and 92: determining what those right number
Page 93 and 94: the ground. The system is initially
Page 95 and 96: calculators, you almost certainly w
Page 97 and 98: and minimize M.” With such a ques
Page 99 and 100: 2. WHAT IS THE ACCELERATION OF THE
Page 101 and 102: Adding these two equations together
Page 103 and 104: force of friction: . Using Newton
Page 105 and 106: m, placed on a frictionless surface
Page 107 and 108: Frequency is given in units of cycl
Page 109 and 110: of the spring due to the gravitatio
Page 111 and 112: The oscillation of a pendulum is mu
Page 113 and 114: Velocity Calculating the velocity o
Page 115 and 116: Practice Questions 1. . Two masses,
Page 117 and 118: 7. . An object of mass 3 kg is atta
Page 119 and 120: Since the system is in equilibrium,
Page 121 and 122: velocity, v. Linear momentum is den
Page 123 and 124: Conservation of Momentum If we comb
Page 125 and 126: As we might expect, the final veloc
Page 127 and 128: A pool player hits the eight ball,
Page 129 and 130: two-dimensional collision is effect
Page 131 and 132: For a System of Two Particles For a
Page 133 and 134: At the front end of the boat, the f
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4. . A scattering experiment is don
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1. B The athlete imparts a certain
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7. E Momentum is conserved in this
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The diver’s translational motion
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30 π/6 45 π/4 60 π/3 90 π/2 180
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elative position to one another. As
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acceleration given its angular velo
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To find the direction of a rigid bo
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A student exerts a force of 50 N on
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The torque that produces the angula
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The masses in the figure above are
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an object sliding down a frictionle
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Velocity Average Angular Accelerati
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3. . What is the direction of the a
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1. D An object that experiences 120
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At the top of the incline, the disk
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from a Latin word meaning “center
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Newton’s Law of Universal Gravita
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when you are beneath the surface of
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EXAMPLE A satellite of mass is laun
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Kepler’s Laws After poring over t
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Practice Questions Questions 1-3 re
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8. . A satellite orbits the Earth a
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Circumference and radius are relate
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learn how heat is transferred from
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heat, like rubber, have a high spec
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Just as specific heat tells us how
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Conduction is the transfer of heat
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Effectively, this equation tells us
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the way that it does. The Laws of T
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There are a number of equivalent fo
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If we know our formulas, this probl
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5. . An ideal gas is enclosed in a
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Asphalt, like most materials, has a
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The things we call atoms today are
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If they come up on SAT II Physics,
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will move in the opposite direction
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Work The work done to move a charge
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Much like gravitational potential e
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3. . A particle of charge +2q exert
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7. . A particle of charge +q is a d
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The vector sum of the three vectors
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Voltage The batteries we use in fla
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This equation tells us that we can
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If the two variables you know are a
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However, each resistor causes a vol
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So = 4 . WHAT IS THE CURRENT RUNNIN
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Consider again the circuit whose to
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This circuit consists of resistors
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The junction rule deals with “jun
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across the loop. We can express the
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capacitance is halved. The proporti
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The Greek letter is called the diel
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4. . Two resistors, and , are ident
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10. . A dielectric is inserted into
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The equivalent capacitance of two c
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The Earth itself acts like a huge b
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Because the velocity vector and the
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A particle with a positive charge o
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The constant is called the permeabi
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1. . The pointer on a compass is th
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7. . A positively charged particle
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1. B To solve this problem, it is h
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If the particle is to move at a con
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flowing in the counterclockwise dir
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Next, let’s calculate the flux th
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Remember that field lines come out
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Magnetic Flux Faraday’s Law / Len
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5. . A wire carrying 5.0 V is appli
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In this equation, A is the amplitud
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Ernst attaches a stretched string t
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A string is tied to a pole at one e
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other. The principle of superpositi
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Nodes The crests and troughs of a s
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The Doppler Effect So far we have o
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Practice Questions 1. . Which of th
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6. . Two pulses travel along a stri
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1. B Simple harmonic motion is defi
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where and are the frequency heard b
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A higher frequency—and thus a sho
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The phenomenon of refraction result
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Since we know that the ratio of / i
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The four basic kinds of optical ins
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You can test all this yourself with
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Because is a positive number, we kn
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As the diagram shows us, and as the
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At any point P on the back screen,
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Note that the pattern is brightest
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One of the more common ways of test
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3. . When the orange light passes f
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9. . Sound waves do not exhibit pol
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7. E Only concave mirrors and conve
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For people who believed that light
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What does this all mean? Time is re
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A spaceship flying toward the Earth
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Rutherford’s Gold Foil Experiment
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The Wave Theory of Electromagnetic
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The Problem with Rutherford’s Mod
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Don’t worry: you don’t need to
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A hydrogen atom is energized so tha
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where is the uncertainty in a parti
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electrons have mass, it is so negli
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chapters on mechanics are the resul
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You won’t need to calculate the n
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Photoelectro n Radius of Electron O
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5. . An electron is accelerated thr
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according to the formula , where l
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In radioactive substances, the numb
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A scale for measuring temperature,
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The points of maximum displacement
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Electromagnetic spectrum The spectr
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The amount of time it takes for one
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Given the period, T, and semimajor
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The substance that is displaced as
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A back-and-forth movement about an
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Refracted ray Refraction Restoring
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T Tail Tangent A body or set of bod
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Weber Weight The force involved in
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pinpointing what you need to study
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If you got a question wrong because
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