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Chapter 4: Q. 18 (page 106)
A boat takes 3.0 hours to travel down a river, then 5.0 hours to return. How fast is the river flowing?
The speed of the river is .
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a. At this instant, is the particle in FIGURE Q4.2 speeding up, slowing down, or traveling at constant speed?
b. Is this particle curving upward, curving downward, or traveling straight?
Problems 1 and 2 show a partial motion diagram. For each:
a. Complete the motion diagram by adding acceleration vectors.
b. Write a physics problem for which this is the correct motion diagram. Be imaginative! Don't forget to include enough information to make the problem completely and to state clearly what is to be found.
Tarzan swings through the jungle by hanging from a vine.
a. Immediately after stepping off a branch to swing over to another tree, is Tarzan's accelerationzero or not zero? If not zero, which way does it point? Explain.
b. Answer the same question at the lowest point in Tarzan's swing.
Starting from rest, a DVD steadily accelerates to in , rotates at this angular speed for , then steadily decelerates to a halt in . How many revolutions does it make?
15. In the Olympic shotput event, an athlete throws the shot with an initial speed of 12.0 m/s at a angle from the horizontal. The shot leaves her hand at a height of 1.80 m above the ground. How far does the shot travel?
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