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jkh4
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Homework Statement
Comet moves around the sun in a very ellipical orbit around the sun. As it approach, in 1986, Comet Halley was 8.79x10^7km from the sun and moving with a speed of 54.6km/s. What will be the comet's speed be when it crosses Neptune's orbit in 2006?
length of comet from the sun = 8.79x10^7km = 8.79x10^10 m
v of comet = 54.6km/s = 54.6x10^3m/s
T = 20 years
length of neptune from the sun = 4.50x10^12m
Homework Equations
i use the equation T^2 = (4*pie*r^3)/GM and K2 + U2 = K1 + U1
The Attempt at a Solution
i first use the Kelper's rule to find M of the comet, but i don't really know if that's the right step to start with.
Thank you.