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ps01sol

# ps01sol - MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department...

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MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics Physics 8.01 Fall 2010 Problem Set 1: Vectors Problem 1: Reading Question Monday/Tuesday Class September 13/14. In the textbook, Eqs. 2.17 and 2.18 (page 58) describe how to find the x-component of the velocity and the position at any time. On page 49, Eq. 2.12 also describes the position as a function of time. Describe under what circumstances should you use Eqs. 2.17 and Eqs. 2.18 and when it is okay to use Eq. 2.12. Answer: You can use Eq. 2.17 and 2.18 when the acceleration is a function of time. Eq. 2.12 is a special case when the acceleration is constant in time. You cannot use the Eq. 2.17 and 2.18 if the acceleration is a function of position or velocity and you do not how the position or velocity are in turn dependent on time. Problem 2: Reading Question Wednesday/Thursday Class September 15/16. Two people are running at the same speed in the same direction. One person is one meter ahead of the other. The person in front throws a ball to the person slightly behind. As seen by an observer at rest on the ground, is it possible that the ball was thrown forward?

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