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Chapter 2: Q. 10 (page 58)
A bicycle is traveling east. Can its acceleration vector ever point west? Explain.
Yes, the acceleration vector of the motion of the bicycle can point west.
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A particle starts from x0 = 10 m at t0 = 0 s and moves with the velocity graph shown in FIGURE EX2.6. a. Does this particle have a turning point? If so, at what time? b. What is the object’s position at t = 2 s and 4 s?
A lead ball is dropped into a lake from a diving board 5.0 m
above the water. After entering the water, it sinks to the bottom with a constant velocity equal to the velocity with which it hit the water. The ball reaches the bottom 3.0 s after it is released. How deep is the lake?
(a) Give an example of a vertical motion with a positive velocity and a negative acceleration. (b) Give an example of a vertical motion with a negative velocity and a negative acceleration.
A 200 kg weather rocket is loaded with 100 kg of fuel and
fired straight up. It accelerates upward at 30 m/s2 for 30 s, then runs out of fuel. Ignore any air resistance effects.
a. What is the rocket’s maximum altitude?
b. How long is the rocket in the air before hitting the ground?
A rock is dropped from the top of a tall building. The rock’s displacement in the last second before it hits the ground is 45% of the entire distance it falls. How tall is the building?
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