國際高中學(xué)校斯代文森國際高中PhysicsTest.doc

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PHYSICS: Final Examination Class _ 11A _ Name ( Chinese & English ) _________________________ Score ________________ 1. Two of the tires on a farmer’s tractor have diameters of 1.5 m. If the farmer drives the tractor at a linear velocity of 3.0 m/s, what is the angular velocity of each tire? A. 2.0 rad/s B. 2.3 rad/s C. 4.0 rad/s D. 4.5 rad/s 2. A skater with a mass of 50.0 kg slides across an icy pond with negligible friction. As he approaches a friend, both he and his friend hold out their hands, and the friend exerts a force in the direction opposite to the skater’s movement, which slows the skater’s speed from 2.0 m/s to 1.0 m/s. What is the change in the skater’s kinetic energy? A. -25 J B. -75 J C. -100 J D. -150 J 3. A bicyclist increases her speed from 4.0 m/s to 6.0 m/s. The combined mass of the bicyclist and the bicycle is 55 kg. How much work did the bicyclist do in increasing her speed? A. 11 J B. 28 J C. 55 J D. 550 J 4. A force of 16 N exerted against a rock with an impulse of 0.8 kg?m/s causes the rock to fly off the ground with a speed of 4.0 m/s. What is the mass of the rock? A. 0.2 kg B. 0.8 kg C. 1.6 kg D. 4.0 kg 5. A child attempts use a wrench to remove a nut on a bicycle. Removing the nut requires a torque of 10 N?m. The maximum force the child is capable of exerting at a 90? angle is 50 N. What is the length of the wrench the child must use to remove the nut? A. 0.1 m B. 0.15 m C. 0.2 m D. 0.25 m 6. An 82-kg hockey goalie, standing at rest, catches a 0.105 kg hockey puck that is moving at a speed of 46 m/s. With what speed does the goalie slide on the ice? A. 0.059 m/s B. 0.56 m/s C. 1.2 m/s D. 5.3 m/s 7. You drop a 6.010--2-kg ball from a height of 1.0 m above a hard, flat surface. The ball strikes the surface and its energy decreases by 0.14 J. It then bounces back upward. How much kinetic energy does the ball have just after it bounces from the flat surface? A 0.20 J B. o.59 J C. 0.45 J D. 0.73 J 8. Two people carry identical 40.0-N boxes up a ramp. The ramp is 2.00 m long and rests on a platform that is 1.00 m high. One person walks up the ramp in 2.00 s, and the other person walks up the ramp in 4.00 s. What is the difference in power the two people use to carry the boxes up the ramp? A. 5.00 W B. 10.0 W C. 20.0 W D. 40.0 9. A car moves a distance of 420 m. Each tire on the car has a diameter of 42 cm. Which shows how many revolutions each tire makes as they move that distance? A. rev. B. rev. C. rev. D. rev. 10. What is meant by “an isolated system”? 11. In a spin cycle of a clothes washer, the drum turns at 635 rev/min. If the lid of the washer is opened, the motor is turned off. If the drum requires 8.0 s to slow to a stop, what is the angular acceleration of the drum? 12. When you jump from a height to the ground, you let your legs bend at the knees as your feet hit the floor. Explain why you do this in terms of the impulse-momentum theorem. 13. If the work done on an object doubles its kinetic energy, does it double its speed? If not, by what ratio does it change the speed? 14. A cart, weighing 24.5 N, is released from rest on a 1.00-m ramp, inclined at an angle of 30.0? above the ground. The cart rolls down the incline and strikes a second cart weighing 36.8 N. Define the two carts as the system. a. Calculate the speed of the first cart at the bottom of the incline. b. If the two carts stick together, with what initial speed will they move along? 15. An airplane passenger carries a 215-N suitcase up the stairs, a displacement of 4.20 m vertically and 4.60 m horizontally. a. How much work does the passenger do on the stairs? b. The same passenger carries the same suitcase back down the same stairs. How many works does the passenger do on the suitcase to carry it down the stairs? 16. A skier starts from rest at the top of a 45.0-m-high hill, skis down a 30? incline into a valley, and continues up a 40.0-m-high hill. The heights of both hills are measured from the valley floor. Assume that friction is negligible and ignore the effect of the ski poles. a. How fast is the skier moving at the bottom of the valley? b. What is the skier’s speed at the top of the second hill? c. Do the angles of the hills affect your answers? Bonus: 1. Is Earth a closed, isolated system? Support your answer. 2. A ball drops 20 m. When it has fallen half the distance, or 10 m, half of the energy is potential and half is kinetic. When the ball has fallen for half the amount of time it takes to fall, will more, less, or exactly half of the energy be potential energy?