Lesson 4 - Answers to Suggested Problems
After you have had a chance to try the suggested
end-of-chapter conceptual questions, problems and exercises,
you can check your answers against mine below. (Please alert
Jason Harlow jharlow@physics.utoronto.ca if you notice any
errors in the answers.)
Conceptual
Questions [These start on page 79.]
13. Yes. When turning at constant
speed, the acceleration is not zero, since the direction of
the velocity is changing.
14.
No. If the velocity is constant, the acceleration must
be zero, since the acceleration is the rate of change of
velocity.
15. Example: A ball rolls up an incline. When it gets
to the top, its velocity is zero momentarily, but its
acceleration is not zero.
16. To the right. Positive.
Problems and Exercises [These start on
Page 82.]
16. 4.29 m/s2 (NOTE: This
is actually the cheetah's average acceleration over
these 7.00 s.)
18. (a) 1.43 s (b) |a| = 2.50 m/s2