Chapter 2: Q3CQ (page 50)
If a car is traveling eastward, can its acceleration be westward? Explain.
If a car is traveling eastward, its acceleration can be westward.
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An object is at x=0 at t=0 and moves along the xaxis according to the velocity-time graph in Figure P2.62.
(a) What is the object's acceleration between 0 and 4.0s?
(b) What is the object's acceleration between 4.0sand 9.0s?
(c) What is the object's acceleration between 13.0s and 18.0s?
(d) At what time(s) is the object moving with the lowest speed?
(e) At what time is the object farthest from x=0?
(f) What is the final position x of the object at t=18.0s?
(g) Through what total distance has the object moved between t=0 and t=18.0s?
A skateboarder starts from rest and moves down a hill with constant acceleration in a straight line, traveling for 6 s. In a second trial, he starts from rest and moves along the same straight line with the same acceleration for only 2 s. How does his displacement from his starting point in this second trial compare with that from the first trial? (a) one-third as large (b) three times larger (c) one-ninth as large (d) nine times larger (e) times as large.
Find the instantaneous velocity of the particle described in Figure P2.1 at the following times: (a) t=1.0s, (b) t=3.0s, (c) t=4.5s, and (d) t=4.5s .
(a) Can the velocity of an object at an instant of time be greater in magnitude than the average velocity over a time interval containing the instant? (b) Can it be less?
A pebble is dropped from rest from the top of a tall cliff and falls 4.9m after 1.0 s has elapsed. How much farther does it drop in the next 2.0 s?
(a) 9.8m
(b) 19.6m
(c) 39m
(d) 44m
(e) none of the above.
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