PHYSICS 1 MIDTERM EXAM REVIEW #2

1. A 6.0-N force and an 8.0-N force act concurrently on a point. As the angle between these forces increases from 0° to 90°, the magnitude of their resultant (1) decreases (2) increases (3) remains the same

2. A car increases its speed from 9.6 m/s to 11.2 m/s in 4.0 s. The average acceleration of the car during this 4.0-second interval is (1) 0.40 m/s2 (3) 2.8 m/s2 (2) 2.4 m/s2 (4) 5.2 m/s2

3. What is the speed of a 2.5-kilogram mass after it has fallen freely from rest through a distance of 12 m? (1) 4.8 m/s (3) 30. m/s (2) 15 m/s (4) 43 m/s

4. A machine launches a tennis ball at an angle of 25° above the horizontal at a speed of 14 m/s. The ball returns to level ground.
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Compared to the horizontal component of the car’s velocity at point A, the horizontal component of the car’s velocity at point B is (1) smaller (2) greater (3) the same

18. A force of 25 N east and a force of 25 N west act concurrently on a 5.0-kg cart. What is the acceleration of the cart? (1) 1.0 m/s2 west (3) 5.0 m/s2 east (2) 0.20 m/s2 east (4) 0 m/s2

19. Centripetal force Fc acts on a car going around a curve. If the speed of the car were twice as great, the magnitude of the centripetal force necessary to keep the car moving in the same path would be (1) Fc (2) 2 Fc (3) Fc / 2 (4) 4 Fc

20. A 1.0 x 105-newton truck at rest on a hill that makes an angle of 8.0° with the horizontal. What is the component of the truck’s weight parallel to the hill? (1) 1.4 x 103 N (3) 1.4 x 104 N (2) 1.0 x 104 N (4) 9.9 x 104 N

21. A book of mass m falls freely from rest to the floor from the top of a desk of height h. What is the speed of the book upon striking the floor? (1) (2gh)½ (3) mgh (2) 2gh (4) mh

22. A 0.149-kg baseball, initially moving at

15 m/s, is brought to rest in 0.040 s by a baseball glove on a catcher’s hand. The magnitude of the average force exerted on the ball by the glove is (1) 2.2 N (3) 17 N (2) 2.9 N (4) 56 N

23. Which body is in equilibrium? (1) a satellite moving around Earth in a circular orbit (2) a cart rolling down a frictionless

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