6. +-/7 points My Notes Ask Your Teacher A comet moves about the Sun in an ellip

Question

6. +-/7 points My Notes Ask Your Teacher A comet moves about the Sun in an elliptical orbit, with its closest approach to the Sun being about 0.860 AU and its greatest distance from the sun being 57.0 AU (1 AU = the Earth-Sun distance) (a) Which of the comet's properties are conserved as the comet goes around the Sun? Select all that apply. linear momentum O kinetic energy angular momentum O potential energy total energy (b) If the comet's speed at closest approach is 54.0 km/s, what is its speed when it is farthest from the Sun?

Explanation / Answer

a) angular momentum is conserved as there is no external torque on the comet ,also total energy is conserved as there is no energy loss anywhere anytime .

b)angular momentum is conserved so

mv1r1 = mv2r2

54 *0.86AU = V2 *57AU

V2= 0.8147 Km/s

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