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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 Fall '08
 Fowler
 Mass, Work, Kepler's laws of planetary motion, home dish reception

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