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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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Your goal in the laboratory is to launch a ball of mass m straight up so that it reaches exactly the height h above the top of the launching tube. You and your lab partners will earn fewer points if the ball goes too high or too low. The launch tube uses compressed air to accelerate the ball over a distance d, and you have a table of data telling you how to set the air compressor to achieve the desired acceleration. Find an expression for the acceleration that will earn you maximum points
A speed skater moving to the left across frictionless ice at 8.0 m/s hits a 5.0-m-wide patch of rough ice. She slows steadily, then continues on at 6.0 m/s. What is her acceleration on the rough ice?
A skier is gliding along at 3.0 m/s on horizontal, frictionless snow. He suddenly starts down a 10掳 incline. His speed at the bottom is 15 m/s.
a. What is the length of the incline?
b. How long does it take him to reach the bottom ?
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.
FIGURE EX2.7 showed the velocity graph of blood in the aorta. What is the blood鈥檚 acceleration during each phase of the motion, speeding up and slowing down?
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