Physics 30S Final Exam Review-2.pdf

R.R.S.D Physics 40S – Final ExamJanuary, 2005Name: _________________Multiple Choice1A B C D12342A B C D12343A B C D12344A B C D12345A B C D12346A B C D12347A B C D12348A B C D12349A B C D123410A B C D123411A B C D123412A B C D123413A B C D123414A B C D123415A B C D123416A B C D123417A B C D123418A B C D123419A B C D123420A B C D123421A B C D123422A B C D123423A B C D123424A B C D123425A B C D123426A B C D123427A B C D123428A B C D123429A B C D123430A B C D123431A B C D123432A B C D123433A B C D123434A B C D123435A B C D123436A B C D123437A B C D123438A B C D123439A B C D123440A B C D123441A B C D123442A B C D123443A B C D123444A B C D123445A B C D123446A B C D123447A B C D123448A B C D123449A B C D123450A B C D1234Instructions• Use the formulasheet provided• Shade in yourmultiple choiceanswers• Clearly indicatefinal answers• You have 3 hoursfor this examMark DistributionTopic M/C L/A TotalMechanics 21 19 40Fields 12 13 25Electricity & E-M 13 12 25InductionMedical Physics 4 6 10Total 50 50 100

Physics 40S RRSD Final Exam – June 2005 Page 2Part A – Multiple Choice [50 marks]1. A ball dropped from rest falls freely until it hits the ground with a speed of 20meters per second. The time during which the ball is in free fall isapproximatelya) 1 s c) 0.5 sc) 2 s d) 10 s2. An astronaut on the moon throws a 5.0 kg wrench vertically upwards with aninitial speed of 15 m/s. The acceleration due to gravity on the surface of themoon is one-sixth that on the surface of the earth. What is the maximum heightreached by the wrench?a) 25 m b) 46 mc) 69 m d) 75 m3. The graph below represents an object's motion for twenty seconds.Using the graph, the acceleration of the object at 6 seconds is:a) -102m/s b) 102m/s c) -52m/s d) 52m/s

Physics 40S RRSD Final Exam – June 2005 Page 34. The diagram below shows a resultant vector, R.Which diagram best represents a pair of component vectors, A and B, thatwould combine to form resultant vector R?5. A force that is pushing at 5.0 N [53° S of E] would have east/west (or ‘X’)component of:a) +3.0 N b) -3.0 Nc) +4.0 N d) -4.0 N6. A 1200 kg trailer is accelerated at a rate offriction acting on the trailer is 800 N.23.0 m/s . The average force ofWhat is the pulling force applied to the trailer through the hitch?a) 800 N b) 2800 Nc) 3600 N d) 4400 N

Physics 40S RRSD Final Exam – June 2005 Page 47. Elaine is a championship lawn bowler. Her practice lawn bowling lawn is 30mlong. Her ball takes 12 seconds to stop. At what rate does her ball decelerate?a) 0.12 m/s/s b) 0.22 m/s/sc) 0.32 m/s/s d) 0.42 m/s/s8. A 50-kilogram student threw a 0.40-kilogram ball with a speed of 20.0 metersper second. What was the magnitude of the impulse that the student exerted onthe ball?a) 8.0 N•s b)c) 78 N•s d)24.0×10 N•s31.0×10 N•s9. The two objects shown below collide head-on. The velocity of the 9.5 kg objectafter collision is 5.4 m/s to the left. The velocity of the 2.4 kg object aftercollision is :a) 15 m/s to the right b) 8.7 m/s to the leftc) 8.0 m/s to the right d) 6.2 m/s to the left10. A 0.2-kilogram red ball is thrown horizontally at a speed of 4 meters per secondfrom a height of 3 meters. A 0.4-kilogram green ball is thrown horizontallyfrom the same height at a speed of 8 meters per second. Compared to the time ittakes the red ball to reach the ground, the time it takes the green ball to reachthe ground is:a) one-half as great b) the samec) twice as great d) four times as great11. Which of the following units are correct units for momentum?a) J•s b) N•mc) N•s d) N J12. The time a projectile is in the air depends on:a) its mass b) its horizontal velocityc) its vertical velocity d) none of the above

Physics 40S RRSD Final Exam – June 2005 Page 513. A golf ball is hit with an initial velocity of 15 meters per second at an angle of35 degrees above the horizontal. What is the vertical component of the golfball’s initial velocity?a) 8.6 m/s b) 12 m/sc) 9.8 m/s d) 15 m/s14. A 0.25-kg ball is thrown upwards with an initial velocity of 12 m/s at an angleof 30 degrees. Determine the acceleration of the ball when it has reached thepeak of its trajectory. Assume negligible air resistance.2a) 0 m/s2b) -6 m/s2c) -9.8 m/s d) -12 m/s15. The diagram below represents a 0.40-kilogram stone attached to a string. Thestone is moving at a constant speed of 4.0 meters per second in a horizontalcircle having a radius of 0.80 meter.2The magnitude of the centripetal acceleration of the stone is2a) 0.0 m/s b) 5.02c) 2.0 m/s d) 20.m/sm/s16. Roxanne is making a strawberry milkshake in her blender. A tiny, 0.0050 kgstrawberry is rapidly spun around the inside of the container with a speed of14.0 m/s held by a centripetal force of 10.0 N. What is the radius of theblender at this location?a) 0.098 m b) 0.049 mc) 0.007 m c) 0.014 m22

Physics 40S RRSD Final Exam – June 2005 Page 617. A car travels in a circle with a constant speed. The net force on the cara) is directed forward in the direction of travelb) is directed toward the center of the curvec) is zero because the car is not acceleratingd) is directed outwards from the center18. A 45.0-kilogram boy is riding a 15.0-kilogram bicycle with a speed of 8.00meters per second. What is the combined kinetic energy of the boy and thebicycle?a) 240.J b) 1440 Jc) 480. J d) 1920 J19. A 40.-kilogram student runs up a staircase to a floor that is 5.0 meters higherthan her starting point in 7.0 seconds. The student’s power output is3a) 29 W b) 1.4× 10 W4c) 280 W d) 1.4× 10 W20. You walk to class at a steady pace along a flat, horizontal path. Your backpackweighs 100 Newton’s and your trip is 500 meters long. How much work do youdo on your backpack?a) 0 joules b) 1/5 joulec) 50,000 joules d) 5 joules21. The work done in pushing a lawnmower 100 m with a force applied of 30 N atan angle which is 60° to the horizontal is:a) 300 J b) 3000Jc) 1000 J d) 1500 J22. Two objects attract each other with a force of gravity (Fg) of 36 N. If thedistance separating the objects is doubled and the mass of one of the objects isdoubled, then what is the new force of gravitational attraction?a) 48 N b) 27 Nc) 12 N d) 18 N23. An asteroid has a mass of 5.2 x 10 19 kg and a radius of 45 km. What is thevalue of "g" on it's surface?a) 3.8 m/s 2 b) 1.7 m/s 2c) 10.6 m/s 2 d) 0.89 m/s 2

Physics 40S RRSD Final Exam – June 2005 Page 724. According to Kepler's second law of planetary motion,a) all planets have equal areas when viewed from a position on the sunb) all equal planets have the same sun.c) all planets travel the same speed when moving along their orbital patharound the sun.d) a planet travels fastest along its orbital path when closest to the sun.425. A 5.0× 10 kg moon travels in a circular path around a planet. The moon orbital722radius is 2.5× 10 m and the velocity is 4.2× 10 m/s. What is the mass of theplanet?a)c)81.1× 10 kg b)273.4× 10 kg d)6.6 102.5× 10 kg22× kg2826. Where is it most likely to experience or use the “sling shot effect”?a) interplanetary travel b) working in a magnetic fieldc) working in an electric field d) working in a gravitational field27. If the mass of the satellite is doubled then the speed of the satellite:a) doubles b) one-halfc) same d) not enough information to determine28. Protons and electrons travelling at high speeds enter a magnetic field parallel totheir direction of travel. Which of the following is correct?a) Only protons are deflectedb) Only electrons are deflected.c) Both protons and electrons are deflectedd) Neither protons nor electrons are deflected.29. A small, negatively charged foam sphere is touched by a similar neutral sphere.The two spheres experience a repulsive force of 6.6 N when they are held 10cm apart. What is the magnitude of the original charge on the foam sphere?a) -5.3 x 10 -6 Cb) -5.3 x 10 -4 Cc) Not enough information to solve the problem.d) -2.8 x 10 -11 C

Physics 40S RRSD Final Exam – June 2005 Page 830. In the diagram below, proton p, neutron n, and electron e are located as shownbetween two oppositely charged plates (exclude the force of gravity).The magnitude of acceleration will be greatest for thea) neutron, because it has the greatest massb) neutron, because it is neutralc) electron, because it has the smallest massd) proton, because it is farthest from the negative plate31. Electric Field lines are drawn:a) From positive to negative charges with a decreasing number of linesindicating a stronger electric field.b) From negative to positive charges with an increasing number of linesindicating a stronger electric field.c) From positive to negative with an increasing number of lines indicating astronger electric field.d) From negative to positive with a decreasing number of lines indicating aweaker electric field.32. Which of the following diagrams best shows the orientation for a set of fourcompasses placed around a current-carrying wire?

Physics 40S RRSD Final Exam – June 2005 Page 933. Which type of field is present near a moving electric charge?a) an electric field, onlyb) a magnetic field, onlyc) both an electric field and a magnetic fieldd) neither an electric field nor a magnetic field34. Which combination has the lowest resistance, if each of the resistors in thefollowing diagrams has a resistance of 4.0Ω ?a) b) c) d)35. What is the resistance in a circuit if a current of 0.50 A flows through the circuitand the voltage drop across the circuit is 12 V?a) 0.042 Ω b) 3.0 Ωc) 6.0Ω d) 24.0 Ω36. A 20 m extension cord has a resistance of 0.8 Ω . What is the resistance of thesame extension cord id it is half as long?a. 1.6 Ω b. 0.8 Ωc. 0.4 Ω d. 0.2 Ω37. Determine the total current flowing through a circuit with a 12 Ωand a 6 Ωresistor hooked in parallel and connected to a 120V battery.a) 6.7 A b) 10 Ac) 30 A d) 480 A38. An electric current is generated in a wire when the wire is:a) held stationary in a magnetic field.b) moved parallel to a magnetic field.c) moved so that it cuts across magnetic field lines.d) all of the above.

Physics 40S RRSD Final Exam – June 2005 Page 1039. An ammeter is connected in ____ and a voltmeter is connected in ____.a) parallel, parallel b) parallel, seriesc) series, parallel d) series, series40. In a step-up transformer, the primary voltage is _______ the secondary voltage.a) equal to b) greater thanc) less than d) need more info to answer41. A bar magnet is dropped through a solenoid as shown. If the current flows inthe indicated direction, which of the following statements is true?a) A is the south pole of the magnet.b) A is the north pole of the magnet.c) A could be either pole of the magnet.d) It is impossible to have the current flowing in thisdirection if the magnet is falling42. A portion of the graph of an AC current source is shownto the right. What is the effective voltage?a) 10 V b) 14 Vc) 28 V d) 40 V43. During the transmission of energy, the amount of power lost can be reduced bydecreasing _____and increasing ______.a) voltage, current b) resistance, currentc) current, voltage d) current, resistance

Physics 40S RRSD Final Exam – June 2005 Page 1144. The primary of a transformer has 400 turns and carries 2.0 A when connected toa 110 V line. The secondary has 2000 turns. What is the current in thesecondary?a) 0.20 A b) 0.40 Ac) 2.5 A d) 10.0 A45. The diagram shows a current carrying wire in a magnetic field. The actualcurrent flows out of the page towards you. The force acting on the wire pushesit:a) towards the N pole of the magnet.b) to the left.c) towards the S pole of the magnet.d) to the right.46. Which of the following is a product of beta minus decay?a) proton b) neutronc) neutrino d) positron47. What is the most likely product of an alpha decay of uranium-235?a) neptunium-235 b) protactinium-235c) thorium-231 d) uranium-23548. Which of the following best describes a beta minus particle?a) an electron b) a positronc) a helium ion d) a neutrino49. Given 80 grams of Cobalt-60 and it’s half life is 5.3 years. In 10.6 years theamount of Cobalt-60 remaining is:a) 10 grams b) 20 gramsc) 40 grams d) 60 grams50. A generator is producing an amount of electricity. Of the following, whichmost likely explains how the electrical energy is produced?a) Coulomb’s Law b) Lenz’s Lawc) Ampere’s Law d) Newton’s LawNS

Physics 40S RRSD Final Exam – June 2005 Page 12Part A – Long Answer [50 marks]Show all work in the space providedLong Answer – Mechanics (19)→ →1. Given the following vectors: A = 20 N @ 42° and B = 20N@ 210°. Find→→A+ B using either trigonometry or vector components. [3]2. Find the unknown quantities in the diagram below, given that the object moveswith constant velocity. Show all work. [4]3. A car travelling with a speed of 3.0 m/s is coasting towards an incline (seediagram). Using conservation of energy concepts, determine how high(verticalheight) the car coasts up the hill on the right. Assume no friction. [3]

Physics 40S RRSD Final Exam – June 2005 Page 134. A 1.50 kg stone is whirled in a horizontal circle by a rope 2.40 m long,completing 5 revolutions in 2.00 s. What is the tension in the rope? (thecentripetal force) [2]5. A projectile is launched at an angle of 25° above the horizontal with an initialvelocity of 85 m/s. Neglecting air resistancea) find the maximum height reached. [2]b) Find the range [2]

Physics 40S RRSD Final Exam – June 2005 Page 1436. A 1.000 × 10 -kilogram empty cart moving with a speed of 6.0 meters persecond is about to collide with a stationary loaded cart having a total mass of35.000× 10 kilograms, as shown. After the collision, the carts lock and movetogether. [Assume friction is negligible.]a) Calculate the speed of the combined carts after the collision. Show allwork, including the equation and substitution with units. [2]b) Calculate the kinetic energy of the combined carts after the collision.Show all work, including the equation and substitution with units. [1]Long Answer – Fields (13)7. Identify two issues pertaining to the pursuit of space exploration and brieflydiscuss each. [2]

Physics 40S RRSD Final Exam – June 2005 Page 158. If the gravitational force between two objects of equal mass is 2.30× 10 −8 Nwhen the objects are 10.0 m apart, what is the mass of each object? [3]9. At what distance from the Earth’s surface is the gravitational field strength 7.33N/kg? [3]10. An electron passes through a magnetic field at right angles to the field. Thestrength of the magnetic field is 3.9× 10 −2 T and the force on the electron is1.5× 10 −14 N. What is the speed of the electron? [2]

Physics 40S RRSD Final Exam – June 2005 Page 1611. A magnetic field, of 1.8 T, runs directly into this page. An electron runs from4the bottom of the page towards the top at a speed of 2.5× 10 m/s. What is themagnitude and direction of the force the electron experiences as it enters themagnetic field? [3]Long Answer – Electricity & E-M Induction (12)12. Calculate the missing quantities. [4]13. What is the velocity of an alpha particle moving in a circular path of radius 10.0cm in a plan perpendicular to a 1.7 T magnetic field? [2]14. A charge of 4.70× 10 −8 C is placed in an electric field of intensity43.95× 10 N/C. What is the magnitude of the electric force on the charge? [2]

Physics 40S RRSD Final Exam – June 2005 Page 1715. A transformer has 100 turns on its primary side, and 600 turns on its secondaryit is used to power an elevator motor that requires 2.0 amps at 600 volts. Whatis the potential difference and the current on the primary side of thetransformer. [2]16. Describe the difference between electron flow model, versus the conventionalflow model, for electric circuits. [2]Medical Physics (Long Answer 6 marks)17. Find the missing particle in each case, and determine whether the equationrepresents alpha or beta decay. [2]a)b)82Pb →83Bi + _________210 21090Th→88Ra + _________230 226

Physics 40S RRSD Final Exam – June 2005 Page 1818. Iodine-131 is a radioactive element used in the medical diagnosis and treatmentof thyroid problems. Iodine-131 undergoes simultaneous beta and gamma decayand has a half-life of 8.00 days.a) Write the complete decay equation for iodine-131 [1]b) Complete the table below by entering the amount of iodine-131remaining over 40 days. [1]c) Explain how you obtained data for the table. [1]d) Provide a graph of the theoretical decay of 2.00 g of iodine-131. Plotmass versus time on the plot below. [1]*** End of Exam ***