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Chapter 2: Q22. (page 44)
A car slows down from 28 m/s to rest at a distance of 88 m. What is its acceleration, assumed constant?
The acceleration of the car is .
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In a putting game, the force with which a golfer strikes a ball is planned so that the ball will stop within some small distance of the cup, say 1.0 m long or short, in case the putt is missed. Accomplishing this from an uphill lie (that is, putting the ball downhill, see Fig. 2鈥�47) is more difficult than from a downhill lie. Assume that on a particular green, the ball constantly decelerates atgoing downhill and atgoing uphill to see why. Suppose you have an uphill lie 7.0 m from the cup. Calculate the allowable range of initial velocities you may impart to the ball so that it stops in the range 1.0 m short to 1.0 m long of the cup. Do the same for a downhill lie 7.0 m from the cup. What, in your results, suggests that the downhill putt is more difficult?
FIGURE 2-47 Problem 70
A bird can fly at 25 km/h. How long does it take to fly 3.5 km?
A driver is traveling at 18.0 m/s when she sees a red light ahead. Her car is capable of decelerating at a rate of 3.65 m/s2. If it takes her 0.350 s to get the brakes on, and she is 20.0 m from the intersection when she sees the light, will she be able to stop in time? How far from the beginning of the intersection will she be, and in what direction?
Roger sees water balloons fall past his window. He notices that each balloon strikes the sidewalk 0.83 s after passing his window. Roger鈥檚 room is on the third floor, 15 m above the sidewalk. (a) How fast are the balloons traveling when they pass Roger鈥檚 window? (b) Assuming the balloons are being released from rest, from what floor are they being released? Each floor of the dorm is 5.0 m high.
A car is behind a truck goingon the highway. The car鈥檚 driver looks for an opportunity to pass, guessing that his car can accelerate atand that he has to cover the 20-m length of the truck, plus 10-m extra space at the rear of the truck and 10 m more at the front of it. In the oncoming lane, he sees a car approaching, probably at the speed limit,(55 mph). He estimates that the car is about 500 m away. Should he attempt the pass? Give details.
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