Homework Help: Physics

Posted by Alex on Tuesday, June 5, 2012 at 12:11am.

Halley's comet moves about the Sun in a highly elliptical orbit. At its closest approach, it is a distance of 8.90 1010 m from the Sun and has a speed of 54 km/s. When it is farthest from the Sun, the two are separated by 5.30 1012 m. Find the comet's speed at that point in its orbit.

Physics - Alex, Tuesday, June 5, 2012 at 1:08am
Nevermind figured it out, just have to use m1v1=m2v2.
Physics - Elena, Tuesday, June 5, 2012 at 3:32am
v² =G•M/R²
(v1/v2)²=R2/R1,
v2=v1•sqrt(R1/R2)

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