y scalar component x scalar component A. 770 m 250 m file://c:\users\joe\desktop\physics 2A\PLC Assignments - F10\2a_PLC7\index.
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1 Page 1 of 6 1. A certain string just breaks when it is under 400 N of tension. A boy uses this string to whirl a 10-kg stone in a horizontal circle of radius 10. The boy continuously increases the speed of the stone. At approxiately what speed will the string break? A. 10 /s B. 20 /s C. 80 /s D. 100 /s E. 400 /s 2. A quarterback throws a pass at an angle of 35 above the horizontal with an initial speed of 25 /s. The ball is caught by the receiver 2.55 seconds later. Deterine the distance the ball was thrown. A. 13 B. 18 C. 36 D. 52 E Three sticks are arranged to for a right triangle. If the lengths of the three sticks are 0.47, 0.62 and 0.78, what are the three angles of the triangle? A. 90, 45, and 45 B. 90, 62, and 28 C. 90, 59, and 31 D. 90, 48, and 42 E. 90, 53, and A displaceent vector has a agnitude of 810 and points at an angle of 18 above the positive x axis. What are the x and y scalar coponents of this vector? x scalar coponent A. 770 y scalar coponent 250 B.
2 Page 2 of C D E A rock is thrown straight up fro the surface of the Earth. Which one of the following stateents describes the energy transforation of the rock as it rises? Neglect air resistance. A. The total energy of the rock increases. B. The kinetic energy increases and the potential energy decreases. C. Both the potential energy and the total energy of the rock increase. D. The kinetic energy decreases and the potential energy increases. E. Both the kinetic energy and the potential energy of the rock reain the sae. 6. A ball oves with a constant speed of 4 /s around a circle of radius What is the period of the otion? A. 0.1 s B. 0.4 s C. 0.7 s D. 1 s E. 2 s 7. A stunt person jups fro the roof of a tall building, but no injury occurs because the person lands on a large, air-filled bag. Which one of the following best describes why no injury occurs? A. The bag provides the necessary force to stop the person. B. The bag reduces the ipulse to the person. C. The bag increases the aount of tie the force acts on the person and reduces the change in oentu.
3 Page 3 of 6 D. The bag decreases the aount of tie during which the oentu is changing and reduces theaverage force on the person. E. The bag increases the aount of tie during which the oentu is changing and reduces the average force on the person. 8. A helicopter ( = 1250 kg) is cruising at a speed of 25.0 /s at an altitude of 185. What is the total echanical energy of the helicopter? A J B J C J D J E J 9. The surface of a lake has an area of 15.5 k 2. What is the area of the lake in 2? A B C D E A car, starting fro rest, accelerates in a straight-line path at a constant rate of 2.5 /s 2. How far will the car travel in 12 seconds? A. 180 B. 120 C. 30 D. 15 E A baseball is hit upward and travels along a parabolic arc before it strikes the ground. Which one of the following stateents is necessarily true? A. The acceleration of the ball decreases as the ball oves upward.
4 Page 4 of 6 B. The velocity of the ball is zero when the ball is at the highest point in the arc. C. The acceleration of the ball is 0 /s 2 when the ball is at the highest point in the arc. D. The x-coponent of the velocity of the ball is the sae throughout the ball's flight. E. The velocity of the ball is a axiu when the ball is at the highest point in the arc. 12. A projectile is fired fro a gun and has initial horizontal and vertical coponents of velocity equal to 30 /s and 40 /s, respectively. Approxiately how long does it take the projectile to reach the highest point in its trajectory? A. 1 s B. 2 s C. 4 s D. 8 s E. 16 s 13. What is the weight of a 2.50-kg bag of sand on the surface of the earth? A N B N C N D N E N 14. Car One is traveling due north and Car Two is traveling due east. After the collision shown, Car One rebounds due south. Which of the nubered arrows is the only one that can represent the final direction of Car Two? A. 1 B. 2 3
5 Page 5 of 6 C. D. 4 E The iniu takeoff speed for a certain airplane is 75 /s. What iniu acceleration is required if the plane ust leave a runway of length 950? Assue the plane starts fro rest at one end of the runway. A. 1.5 /s 2 B. 3.0 /s 2 C. 4.5 /s 2 D. 6.0 /s 2 E. 7.5 /s An apple crate with a weight of 225 N accelerates along a frictionless surface as the crate is pulled with a force of 14.5 N as shown in the drawing. What is the horizontal acceleration of the crate? A /s 2 B /s 2 C /s 2 D /s 2 E /s Jennifer is walking at 1.63 /s. If Jennifer weighs 583 N, what is the agnitude of her oentu? A kg /s B. 137 kg /s C kg /s D. 672 kg /s
6 Page 6 of 6 E. 951 kg /s 18. The kinetic energy of an 1100-kg truck is J. What is the speed of the truck? A. 21 /s B. 29 /s C. 33 /s D. 17 /s E. 25 /s 19. A Canadian goose flew 845 k fro Southern California to Oregon with an average speed of 30.5 /s. How long, in hours, did it take the goose to ake this journey? A h B h C h D. 462 h E h 20. A rock is suspended fro a string; and it accelerates downward. Which one of the following stateents concerning the tension in the string is true? A. The tension points downward. B. The tension is less than the weight of the rock. C. The tension is equal to the weight of the rock. D. The tension is greater than the weight of the rock. E. The tension is independent of the agnitude of the rock's acceleration.
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