1.

The figure shows elliptical orbit of a planet m about the sun S. the shaded area SCD is twice the shaded area SAB. If t_(1) be the time for the planet to move from C to D and t_(2) is the time to move from A to B, then:

Answer»

SOLUTION :According to KEPLER's `II^(nd)` law, AREA VELOCITY for the palnet is constant
`:. ""(A_1)/(t_1)= (A_2)/(t_2), A_1=2A_(2)`
`:. ""(2A_2)/(t_1)= (A_2)/(t_2)`
`t_1= 2t_2`.


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