Introduction to Physics Primer 

Lesson 9 - Answers to Suggested Problems

by Jason Harlow


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 Question
19. Yes. If the speed of the softball relative to the thrower is the same as the speed of the truck relative to the road. The motion would appear parabolic to the thrower.

Problems and Exercises
53. (a) 4 m/s (b) 7.7 min (c) with no wind the round trip would have taken 22 minutes, but with the wind it takes 27.7 minutes.
56. 17.0 m/s, 22.2 degrees above the horizontal
62. 6.68 m/s, 53.3 degrees south of west