Chapter 4: Q.7. (page 104)
A rock is thrown from a bridge at an angle below horizontal. Immediately after the rock is released, is the magnitude of its acceleration greater than, less than, or equal to ? Explain.
The acceleration of the rock is equal to .
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38. II FIGURE EX4.38 shows the angular-velocity-versus-time graph for a particle moving in a circle. How many revolutions does the object make during the first 4 s?
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?
A circular track has several concentric rings where people can run at their leisure. Phil runs on the outermost track with radius rP while Annie runs on an inner track with radius rA = 0.80rP. The runners start side by side, along a radial line, and run at the same speed in a counterclockwise direction. How many revolutions has Annie made when Annie’s and Phil’s velocity vectors point in opposite directions for the first time?
13. A supply plane needs to drop a package of food to scientists working on a glacier in Greenland. The plane flies 100 m above the glacier at a speed of 150 m/s. How far short of the target should it drop the package?
Your diameter car tire is rotating at when suddenly you press down hard on the accelerator. After traveling , the tire’s rotation has increased to . What was the tire’s angular acceleration? Give your answer in .
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