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Chapter 2: Q. 10 (page 58)
A bicycle is traveling east. Can its acceleration vector ever point west? Explain.
Yes, the acceleration vector of the motion of the bicycle can point west.
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You are 9.0 m from the door of your bus, behind the bus, when it pulls away with an acceleration of 1.0 m/s2. You instantly start running toward the still-open door at 4.5 m/s.
a. How long does it take for you to reach the open door and
jump in?
b. What is the maximum time you can wait before starting to run and still catch the bus?
FIGURE P2.45 shows a set of kinematic graphs for a ball rolling on a track. All segments of the track are straight lines, but some may be tilted. Draw a picture of the track and also indicate the ball鈥檚 initial condition.
David is driving a steady 30 m/s when he passes Tina, who is sitting in her car at rest. Tina begins to accelerate at a steady 2.0 m/s2 at the instant when David passes.
a. How far does Tina drive before passing David?
b. What is her speed as she passes him?
FIGURE Q2.4 shows a position-versus-time graph for the motion of
objects A and B as they move along the same axis.
a. At the instant t = 1 s, is the speed of A greater than, less than,
or equal to the speed of B? Explain.
b. Do objects A and B ever have the same speed? If so, at what
time or times? Explain.
I was driving along at 20 m/s, trying to change a CD and not watching where I was going. When I looked up, I found myself 45 m from a railroad crossing. And wouldn鈥檛 you know it, a train moving at 30 m/s was only 60 m from the crossing. In a split second, I realized that the train was going to beat me to the crossing and that I didn鈥檛 have enough distance to stop. My only hope was to accelerate enough to cross the tracks before the train arrived. If my reaction time before starting to accelerate was 0.50 s, what minimum acceleration did my car need for me to be here today writing these words?
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