First slide

Gravitational force and laws

Question

The radius of orbit of a planet is two times that of the earth. The time period of planet is

Moderate

A

4.2 years
B

2.8 years
C

5.6 years
D

8.4 years

Solution

$T_{2} = T_{1} {(\frac{R_{2}}{R_{1}})}^{3 / 2} = 1 \times {(2)}^{3 / 2} = 2 .8 year$

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