First slide

Gravitational force and laws

Question

The ratio of the distances of two planets from the sun is 1.38. The ratio of their period of revolution around the sun is

Moderate

A

1.38
B

$1 {.38}^{3 / 2}$
C

$1 {.38}^{1 / 2}$
D

${1.38}^{3}$

Solution

$\frac{T_{2}}{T_{1}} = {(\frac{r_{2}}{r_{1}})}^{2} = {(1.38)}^{3 / 2}$

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