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09_1090_hw8

# 09_1090_hw8 - Physics 1090 Homework#8 Due Thursday November...

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Physics 1090 Homework #8 Due Thursday, November 5, 2:00 pm Reading assignment : Chapters 17, 18, 19, 20 of the notes . Kepler’s Laws 1. Use the Kepler’s Laws flashlet to put a planet in an elliptical orbit. Sketch the orbit as accurately as you can (or, you can use the computer to draw it somehow). (a) At the planet’s nearest point to the Sun, the speed reaches a maximum. Take two points close together on either side of this point, and draw the two velocity vectors for these points. By finding the change in velocity between the points (putting the tails of your vectors together and drawing a vector from head to head) find the direction of the acceleration. (b) Now do the same thing for the farthest point from the Sun. By watching the flashlet, how would you say the accelerations at these two points (nearest and farthest) compare? Is one obviously greater? What about the direction of the acceleration? (c) Now consider some point halfway or so between these points. Now speed as well as direction is changing! Try to draw the direction of acceleration here.

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