Page 61 - Schaum's Outline of Theory and Problems of Applied Physics

46 MOTION IN A VERTICAL PLANE [CHAP. 4

Multiple-Choice Questions

4.1. A stone thrown upward has an acceleration that is
(a) smaller than that of a stone thrown downward
(b) the same as that of a stone thrown downward
(c) greater than that of a stone thrown downward
(d) zero until it reaches the highest point in its path

4.2. A ball is dropped from a roof at the same time as another ball is thrown upward from the roof. The two balls
(a) have the same velocity when they reach the ground
(b) have the same acceleration when they reach the ground
(c) reach the ground at the same time
(d) none of the above

4.3. Ball A is dropped from a roof at the same time as ball B is thrown horizontally from the roof. Ball A
(a) reaches the ground first
(b) reaches the ground last
(c) has the greater velocity when it reaches the ground
(d) has the smaller velocity when it reaches the ground

4.4. A bottle falls from a blimp whose altitude is 1200 m. The bottle reaches the ground in approximately
(a) 5 s (c) 16 s
(b) 11 s (d) 245 s

4.5. After a stone dropped from a cliff has fallen 20 m, the stone’s velocity is
(a) 10 m/s (c) 196 m/s
(b) 20 m/s (d) 392 m/s
4.6. A ball is thrown vertically upward at 20 m/s. The ball comes to a momentary stop in approximately

(a) 0.5 s (c) 1.5 s
(b) 1.0 s (d) 2.0 s

4.7. At what velocity will the ball of Question 4.6 reach the ground?
(a) 0.8 m/s (c) 20 m/s
(b) 19.6 m/s (d) 40 m/s

4.8. A ball is thrown downward at 6.0 m/s from a window 12.0 m above the ground. When it reaches the ground, the ball’s
velocity will be
(a) 9.3 m/s (c) 21.3 m/s
(b) 15.3 m/s (d) 52.8 m/s

4.9. A ball is thrown horizontally from a roof at 12.0 m/s. The ball’s velocity 2 s later will be

(a) 12.0 m/s (c) 23.0 m/s
(b) 19.6 m/s (d) 31.6 m/s

4.10. A ball is thrown 40 above the horizontal at 4.0 m/s. After 0.50 s the horizontal component of the ball’s velocity will
◦
be
(a) 2.6 m/s (c) 3.4 m/s
(b) 3.1 m/s (d) 5.5 m/s