all-clickers-exam-1-physics-221

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ALL Clickers - EXAM 1 - Physics 221 Physics (The University of Tennessee) Scan to open on Studocu Studocu is not sponsored or endorsed by any college or university ALL Clickers - EXAM 1 - Physics 221 Physics (The University of Tennessee) Scan to open on Studocu Studocu is not sponsored or endorsed by any college or university Downloaded by mia rubinetti (miarube1212@gmail.com) lOMoARcPSD|30694340

When the KE of a moving object increases by a factor if 16, the magnitude of its momentum? 1. - Increased by a factor of 4 A. 2. A ball initially at rest is hit by a club. It is in contact with a club for 6.0 x 10 ^-3 seconds. Just after the club loses contact with the ball, the ball°s velocity is 2.0 m/s. If the ball°s mass is 50g, what is the magnitude of the impulse the club gives to the ball? A. 0.1 kg m/s 3. A ball initially at rest is his by a club. It is in contact with a club for 6.0 x 10^-3 seconds. Just after the club loses contact with the ball, the balls velocity is 2.0 m/s. If the ball°s mass is 50 g, what was the magnitude of the average net force acting on the ball while in contact with the club? A. 16.7 N 4. A ball (mass 0.40 kg) is initially moving to the left at 40 m/s. After hitting the wall, the ball is moving to the right at 40 m/s. What is the impulse the ball receives during its collision with the wall? A. 32 kg m/s to the right 5. Assume you are in a car driving and come in contact with this proverbial brick wall. Your car can do three things. After the strike, it can go through, come to a stop or bounce back. Which option would be the most dangerous to you assuming similar collision times? A. Bouncing back 6. Two objects with different masses collide and stick to each other. Compare red to before the collision, the system after the collision has? A. The same total momentum but less total kinetic energy m 50g 05kg I Gps Pf pi re 2 mis I C2 COoO5Kg al0Kgm Before r m 4kg Up Pf pi 1 After 0 7 40M IS FI HIB Downloaded by mia rubinetti (miarube1212@gmail.com) lOMoARcPSD|30694340

7. A boy has a mass of 20 kg. He is standing on an icy pond, when a friend throws a 2 kg ball at him with horizontal velocity of 8 m/s. If the boy catches the ball, how fast will he be moving? A. 0.727 m/s 8. A 65 kg physics student is at rest on a 5 kg sled that also holds a chunk of ice with a mass of 2 kg. The student throws the ice horizontally with a speed of 10 m/s relative to the ground. If the sled slides over a frozen pond without friction, how fast in (m/s) are the sled and student traveling with respect to the ground gaffer throwing their chunk of ice? A. 0.286 m/s Before After m 20kg m 2k9 O Feo je 1 V 8mlS o V 16kg Mls MV 161 222kg 727 MIS Beforey After m o ice'S 0 EE on v omis v 0kg mis 70 v t 2 10 20 20 70 V 70 70 o 286 MIS in positive Direction Downloaded by mia rubinetti (miarube1212@gmail.com) lOMoARcPSD|30694340

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9. Two particles of masses 2g and 8g are separated by a distance of 6cm. The distance of their center of mass from the heavier particle is? A. 1.2 10. A baseball bat with uniform density is cut at the location of its center of mass as shown in the figure. The piece with the smaller mass after the cut is? A. Both pieces have the same mass 11. You are driving down the road with a speed of 20 m/s. What is your speed in units of miles per hour? 1 mile = 1609.3m A. 44.7 mph 12. In a large cube, 4 feet on each side, is filled with water. How many cubic meters of water does it hold? 1 meter = 3.28 ft. I z s a s e t me 8g Mz 2g X 0cm X z 6cm X cm miXitM2 M t Mz 8.0 to 2o 1o2g a 0 7 5 277 69 se 72fffmTIj'mI I44o7mphI ft 3048 Downloaded by mia rubinetti (miarube1212@gmail.com) lOMoARcPSD|30694340

A. 1.81 13. In SI units 1 liter = (.1m)^3 = 10^-3 m^3. What is the length of each side of a cube containing 8 milliliter of water? A. 2 x 10^-2 m 14. The average spacing of atoms is about 0.2 - 0.3 nm for all elemental solids and liquids. A human DNA molecule contains about 200 billion atoms. If all the atoms formed one strand pulled out into a line, about how long (order of magnitude) would the line be? A. 50 m 15. Which of the following statements about vectors and scalars are TRUE? A. A vector quantity has a direction and a scalar does not 16. A person walks from A to B along a circular path of radius 10.0 M around 1/2 of the circle. What is the magnitude (in m) of the displacement vector? A. 20m 3.28 3048 4 102192 3 1.21923 1.77 I 1.8 Volume L Bee L V 3 2mm 002 I 10 3m Bf 101 10 20M A B Downloaded by mia rubinetti (miarube1212@gmail.com) lOMoARcPSD|30694340

17. An object moves from one point in space to another. After it arrives at its destination, the magnitude of its displacement is ____________________ the distance it traveled. A. Either smaller or equal to 18. Four different mice labeled (A,B,C, and D) ran the triangular maze shown below. They started in the lower left corner and followed the paths of the arrows. The times they took are shown below each figure. Which mouse had the greatest average speed? Which mouse had the greatest average velocity? A. B and A 19. The position versus time graph represents the motion of an object moving along a straight line. What is the instantaneous velocity of the object at t=14 seconds? A. -(5/3) m/s 20. The velocity versus time graph to the right represents the motion of the object moving in one dimension along the x-axis. Between t=12s and 15s, the velocity of the object is negative. A. FALSE 21. The velocity versus time graph to the right represents the motion of an object moving in one dimension. What is the object°s average acceleration between t=0 and t=6s? t.tt hA Tt 2 Sec E 2 sec t 4 sec t 4 Sec greatest Average greatest Average Velocity Speed Speed total distance total time Velocity displacement 1 time 1.5 ooo velocity is just slowing down Downloaded by mia rubinetti (miarube1212@gmail.com) lOMoARcPSD|30694340

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A. 0.67 m/s^2 22. The positions of two blocks at successive 0.20-second time intervals are represented by the numbered squares in the figure below. The blocks are moving towards the right. The accelerations of the blocks are related as follows: A. The acceleration of A equals the acceleration of B. Both accelerations are zero. 23. A ±motion diagram² is shown. It is a series of snapshots of a bunny°s position taken even 1.0 seconds. What is the direction of the acceleration vector if the bunny is moving to the left? A. In the positive X direction 24. Consider motion in one dimension along the X-axis. Which statement is true? A. An object that is slowing down while traveling in the negative X-direction always has a positive acceleration 25. A race car has a speed of +90 m/s when the driver releases a drag parachute. When the parachute causes a uniform deceleration of -15m/s^2, how long will it take the race car to stop? A. 6s 26. A race car has a speed of +90 m/s when the driver releases a drag parachute. When the parachute causes a uniform deceleration of -15m/s^2, how far will the car travel before it stops? A. 270 m Yz Yi_ 5 12 4 6 67 m s Xz X G O a CVr te ti Lrt 15mi s O 90m of Ot 90mL Ismis2 at 6s f2 iz t Za Xf Xi Downloaded by mia rubinetti (miarube1212@gmail.com) lOMoARcPSD|30694340

27. As i apply the brakes in my car, books one my passenger seat suddenly fly forward. That is most likely because? A. The decelerating car is not in an inertial reference frame 28. A woman exerts a constant horizontal force on a large box. As a result, the box moves across a horizontal floor at a constant speed Vo. The constant horizontal force supplies by the women .... HINT - constant velocity = no acceleration = no net force A. Has the same magnitude as the total force which resists the motion of the box 29. A 50 N force and a 100 N force both act on the same object. What is the net force (total force) acting on the object? A. Not enough information is given 30. A car has a maximum acceleration of 4.5 m/s^2. What would be its maximum acceleration while towing a second car twice its mass? HINT Fmax = Mass x acceleration max A. 1.5 m/s^2 31. A force of 20 N in the positive x-direction accelerates an object with acceleration a = 2 m/s^2. When the object is moving with velocity v = 10 m/s an additional force of 10 N in the negative x-direction is applied. Which statement is true? A. The object now accelerates a = 1 m/s^2 in the positive x-direction 32. A rock is thrown from the roof of a tall building. While it is falling towards the ground, the force of gravity acting on 0 O mis t 2C 15 x Xf Xi 0 8100 MIS 30M 11 30 Mls ox 30 mis GX 3 8100M 30 MIS 1011 27021 Downloaded by mia rubinetti (miarube1212@gmail.com) lOMoARcPSD|30694340

it is? A. Equal to its weight 33. Suppose you are standing on a bathroom scale when you are flying in a jet airplane. For a moment the scale reads more than your actual weight. During that moment, the scale isn extorting an upward force on you that is? A. Greater than your weight 34. Suppose you are standing on a bathroom scale while riding in an elevator. For a moment the scale reads 160 lb = 712 N while your actual weight is 180 lb = 800 N. What is your (and the elevator°s) acceleration? A. -1.1 m/s^2 35. A car traveling at 100 km/hr strikes an unfortunate bug and splatters it. The magnitude of the force of impact is? A. The same for both 36. Arnie and Wimpy are playing tug-of-war. They have the same weight, but Arnie wins, pulling Wimpy into the mud puddle. Why did Arnie win? A. Arnie exerted a greater force on the ground than Wimpy exerted on the ground 37. Consider a car at rest. We can conclude that the downward gravitational force Earth exerts on the car and the upward constant force the surface of Earth exerts on the car are equal in magnitude ands opposite in direction because? A. The net force on the car is zero 38. Your hands pouch on a heavy box to slide it across the floor. The other force of the action/reaction pair is? A. The box pushing backward against your hands F floor mg 712 N 800N 88N a Fnet Im 88 N I 80kg l I MISZ tIEBaaaE Ece o Downloaded by mia rubinetti (miarube1212@gmail.com) lOMoARcPSD|30694340

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39. A ball is dropped from the top of a 125 m tall tower. How long after it has been released does it hit the ground? A. 5 seconds 40. A ball is thrown horizontally from the top of a 125 m tall tower with a speed of 20 m/s. What is the horizontal distance from the building where it strikes the ground? A. 100 m 41. A rock is kicked horizontally at 10 m/s off a cliff. The rock strikes the ground 30 m from the cliff as shown in the figure, What is the approximate height of the cliff H? A. 45 m 42. A car accelerates down a straight highway. Which os the free-body diagrams shown best represents this situation? A. 3 43. Two blocks, one sitting on a table and the other heavier one hanging over its edge, are connected by a light string as shown in the figure. Which force makes the block on the table move, the tension in the string or the weight of the hanging block? A. The tension 44. A horizontal external force of 10 N acts on a 4 kg box that slides across a surface with constant velocity. What is the coefficient of kinetic friction Uk between the box and the surface? A. .25 45. A heavy box sits in the back of a pickup truck. The truck and the box are accelerating towards the left. What is the direction of the frictional force on the box? A. Towards the left 46. A force of magnitude 10 N compresses an ideal spring by 4 mm. How much force is needed to stretch the same spring by 12 mm? Downloaded by mia rubinetti (miarube1212@gmail.com) lOMoARcPSD|30694340

A. 30 N 47. In the figure, a 100 N weight is suspended from two spring scales, each of which has negligible weight. What is the reading of the scales? A. Each scale will read 100 N 48. Some engineers have suggested that we can simulate gravity in outer space by having a circular rotating space station where persons feel an outward-directed fictitious force due to the rotation of the station. The reason they feel such a force is because? A. They are accelerating toward the center of the space station and the walls of the space station provide the centripetal force, which they experience as an apparent weight. 49. A ring shaped space station with a radius of 2 km is spinning, so that the speed of the rim is 100 m/s. A 50 kg woman sits on the inside of the rim. What is the magnitude of her apparent weight? A. 250 N Downloaded by mia rubinetti (miarube1212@gmail.com) lOMoARcPSD|30694340

all-clickers-exam-1-physics-221

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