EBK PHYSICS FOR SCIENTISTS & ENGINEERS
5th Edition
ISBN: 9780134296074
Author: GIANCOLI
Publisher: VST
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Textbook Question
Chapter 2, Problem 76GP
A person jumps from a fourth-story window 15.0 m above a firefighter’s safety net. The survivor stretches the net 1.0 m before coming to rest, Fig. 2–46. (a) What was the average deceleration experienced by the survivor when she was slowed to rest by the net? (b) What would you do to make it “safer” (that is, to generate a smaller deceleration): would you stiffen or loosen the net? Explain.
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Students have asked these similar questions
A person jumps out a fourth-story window 18.0 m above
a firefighter's safety net. The survivor stretches the net
1.0 m before coming
to rest, Fig. 2–45.
(a) What was the
average deceleration
experienced by the
survivor when she was
slowed to rest by the
net? (b) What would
you do to make it
"safer" (that is, to
generate a smaller
deceleration): would
you stiffen or loosen
the net? Explain.
18.0 m
1.0 m
FIGURE 2-45
Problem 62.
In putting, 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 1.0m long or short, in case the putt is missed.
Accomplishing this from an uphill lie (that is, putting the
ball downhill, see Fig. 2–47) is more difficult than from a
downhill lie. To see why, assume that on a particular green
the ball decelerates constantly at 1.8 m/s² going downhill,
and constantly at 2.6 m/s² going uphill. Suppose we have an
uphill lie 7.0 m from the cup. Calculate the allowable range
of initial velocities we 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?
Uphill
lie
Downhill
7.0 m
lie
- 7.0 m
FIGURE 2-47 Problem 70.
(II) In Fig. 2–44, (a) during what time periods, if any, is the velocity constant? (b) At what time is the velocity greatest? (c) At what time, if any, is the velocity zero? (d) Does the object move in one direction or in both directions during the time shown?
Chapter 2 Solutions
EBK PHYSICS FOR SCIENTISTS & ENGINEERS
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- (III) Sketch the v vs. t graph for the object whose displacement as a function of time is given by Fig. 2–44arrow_forwardA person driving her car at 35 km/h approaches an inter- section just as the traffic light turns yellow. She knows that the yellow light lasts only 2.0s before turning to red, and she is 28 m away from the near side of the intersection (Fig. 2–49). Should she try to stop, or should she speed up to cross the intersection before the light turns red? The intersection is 15 m wide. Her car's maximum deceleration is -5.8 m/s?, whereas it can accelerate from 45 km/h to 65 km/h in 6.0 s. Ignore the length of her car and her reaction time. – 28 m - -15 m→ FIGURE 2-49 Problem 73.arrow_forwardA person jumps out a fourth-story window 18.0m above a firefighter's safety net. The survivor stretches the net 1.0m before coming to rest Fig 2-45. (a) What average deceleration experienced by the survivor when she was slowed to rest by the net? (b) What would do to make it safer" (that is, to generate a smaller deceleration): would you stiffen or loosen the net? explain.arrow_forward
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