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Question

The mean distance of Jupiter from the sun is nearly 5.2 times the corresponding distance between earth and sun. Using Kepler's Law, find the period of revolution of Jupiter in its orbit.

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Solution

According to Kepler's Law of period T2r3
where T= period of revolution, r= mean distance from sun
T21T22=r31r32;T1T2=(r1r2)3/2.
Let T2 be the period of revolution of earth around sun and r2 be the mean distance between earth and sun.
Given: (r1/r2)=5.2 and T2=365 days (one year).
Hence, T1=T2(r1r2)3/2=1(5.2)3/2=11.85 years.

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