CLASSICAL DYNAMICS OF PARTICLES AND SYST
5th Edition
ISBN: 9780357670675
Author: Thornton
Publisher: CENGAGE L
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4. A child has a ball on the end of a cord, and whirls
the ball in a vertical circle. Assuming the speed of
the ball is constant (an approximation), when would
the tension in the cord be greatest?
(a) At the top of the circle.
(b) At the bottom of the circle.
(c) A little after the bottom of the circle when the
ball is climbing.
(d) A little before the bottom of the circle when the
ball is descending quickly.
(e) Nowhere; the cord is pulled the same amount at
all points.
3. In a rotating vertical cylinder (Rotor-ride) a rider
finds herself pressed with her back to the rotating
wall. Which is the correct free-body diagram for
her?
(a)
(b)
(c)
(d)
(e)
8. A roller coaster rounds the bottom of a circular
loop at a nearly constant speed. At this point the
net force on the coaster cart is
(a) zero.
(b) directed upward.
(c) directed downward.
(d) Cannot tell without knowing the exact speed.
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