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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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You are given the equations that are used to solve a problem. For each of these, you are to
a. Write a realistic problem for which these are the correct equations. Be sure that the answer your problem requests is consistent with the equations given.
b. Finish the solution of the problem, including a pictorial representation.
6. A rocket-powered hockey puck moves on a horizontal frictionless table. FIGURE EX4.6 shows graphs of and , the x - and y-components of the puck's velocity. The puck starts at the origin.
a. In which direction is the puck moving at ? Give your answer as an angle from the x-axis.
b. How far from the origin is the puck at ?
. II A wheel initially rotating at experiences the angular acceleration shown in FIGURE EX4.39. What is the wheel's angular velocity, in rpm, at ?
FIGURE EX4.39
You’re 6.0 m from one wall of the house seen in FIGURE P4.55. You want to toss a ball to your friend who is 6.0 m from the opposite wall. The throw and catch each occur 1.0 m above the ground.
a. What minimum speed will allow the ball to clear the roof?
b. At what angle should you toss the ball?
Answer Problems 3 through 5 by choosing one of the eight labeled acceleration vectors or selecting option
5. At this instant, the particle is speeding up and curving downward. What is the direction of its acceleration?
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