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- 1. Multiple ChoiceA 2.0 kg book is lying on a 0.75-m-high table. you pick it up and place it on a bookshelf 2.3 m above the floor.
during this process
A. how much work does gravity do on the book?
B. how much work does your hand do on the book?A. -30 J
B. 30 JA. -40 J
B. 40 NA. -100 J
B. -50 JA. 0.29 J
B. 4.98 J - 2. Multiple ChoiceA boy flies a kite with the string at a 30 angle to the horizontal. The Tension in the string is 4.5 N. How much work does the string do on the boy if the boy.
A. stands still?
B. walks a horizontal distance of 11 m away from the kite?
C. Walks a horizontal distance of 11 m toward the kite?A. 6.8 X 10^4 J
B. 30 J
C. 17 m/sA. 10 J
B. 50 J
C. -50 JA. 0 J
B. -43 J
C. 43 JA. 0.1 J
B. 43 J
C. -43 J - 3. Multiple ChoiceA roller coaster starts from rest at its highest point and then descends on its (friction-less) Track. Its speed is 30 m/s when it reaches ground level. what was its speed when its height was half that of its starting point?30 m/s15 m/s10 m/s21 m/s
- 4. Multiple ChoiceA worker uses a pulley and a rope to raise a 20 kg weight to a height of 2 m. If it takes 4 s to do this, about how much power is the worker supplying?100 N100 W50 W110 W
- 5. Multiple ChoiceA block slides down a smooth ramp, starting from rest at a height h. When it reaches the bottom it's moving at speed v. It then continues to slide up a second ramp. At what height is its speed equal to v/2 ?2hh/43h/4h/2
- 6. Multiple ChoiceA 20 g plastic ball is moving to the left at 30 m/s. how much work must be done on the ball to cause it to move to the right at 30 m/s?0.0 J60 J25 J39 J
- 7. Multiple Choice
a 50 g marble moving at 2.0 m/s strikes a 20 g marble at rest. what is the speed of each marble immediately after that collision? assume the collision is perfectly elastic and the marbles collide head-on0.86 m/s and 2.9 m/s1 m/s and 3 m/s.5 m/s and .24 m/s2 m/s and 3 m/s - 8. Multiple Choicea 550 g elevator accelerates upward at 1.2 m/s^2 for the first 15 m of its motion. how much work is done during this part of its motion by the cable that lifts the elevator.100 kJ91 kJ9.1 kJ91 J
- 9. Multiple Choicea 1000 kg sports car accelerates from 0 to 30 m/s in 10 s. what is the average power of the engine50 kW40 W45 kW44.5 kW
- 10. Multiple ChoiceAn elevator weighing 2500 N ascends at a constant speed of 8.o m/s. how much power must the motor supply to do this?2.0 X 10^4 W4 X 10^5 W2.1 X 10^4 W2.0 X 10^8 W
- 11. Multiple ChoiceAn air-track glider undergoes a perfectly inelastic collision with an identical glider that initially at rest. what fraction of the first glider's initial kinetic energy is transformed into thermal energy in this collision1/2.52/4.502
- 12. Multiple Choicea 20 kg child slides down a 3.0-m-high playground slide. the child starts at rest, and her speed at the bottom is 2.0 m/s.
a.) what energy transfers and transformation occur during the slide?
b.) what is the total change in the thermal energy of the slide and the seat of the childs pants?A.) change from potential to kinetic energy
B.) 50 JA.) change from potential to kinetic and thermal energy
B.) 550 JA.) change from kinetic to potential
B.) 550 JA.) from Potential to thermal energy
B.) 155 J - 13. Multiple Choicea 20 kg child slides down a 3.0-m-high playground slide. the child starts at rest, and her speed at the bottom is 2.0 m/s.
a.) what energy transfers and transformation occur during the slide?
b.) what is the total change in the thermal energy of the slide and the seat of the childs pants?A.) change from potential to kinetic energy
B.) 50 JA.) change from potential to kinetic and thermal energy
B.) 550 JA.) change from kinetic to potential
B.) 550 JA.) from Potential to thermal energy
B.) 155 J - 14. Multiple ChoiceA car is parked at the top of a 50-m-high hill. Its brakes fail and it rolls down the hill. How fast will it be going at the bottom? Ignore friction50 m/s21 m/s31 m/s31 m/s^2
- 15. Multiple ChoiceMark pushes his broken car 150 m down the block to his friend's house. He has to exert a 110 N horizontal force to push the car at a constant speed. how much thermal energy is created in the tires and road during this short trip?15 kJ1.65 kJ17 kJ16.5 kJ
- 16. Multiple ChoiceA 50 kg sprinter, starting from rest runs 50 m in 7 s at constant acceleration.
What is the magnitude of the horizontal force acting on the sprinter?100 N10 N50 N100 kj - 17. Multiple ChoiceA 50 g ball of clay traveling at 6.5 m/s hits and sticks to a 1.0 kg block sitting at rest on a friction-less surface.
what is the speed of the block after the collision.9.5 m/s0.31 m/s3.1 m/s.91 m/s - 18. Multiple Choicehow much work must you do to push a 10 kg block of steel across a steel table at a steady speed of 1.0 m/s for 3.0 s. the coefficient of friction for the steel on steel is 0.601.8 X 10^2 J2.8 X 10^4 J1.8 X 10^5 J6.8 X 10^3 kJ
- 19. Multiple ChoiceA 10 kg runaway grocery cart runs into a spring, attached to a wall, with spring constant 250 N/m and compresses it by 60 cm. what was the speed of the cart just before it hit the spring9 m/s0.3 m/s3 m/s3 N
- 20. Multiple Choicewith Minimum speed must you toss a 100 g ball straight up to just barely hit the 10-m-high ceiling of the gymnasium if you release the ball 1.5 m above the floor? solve this problem using energy13 m/s14 m/s1.3 m/s1.5 m/s
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