First slide

Universal law of gravitation

Question

The gravitational force between two bodies is 6.67 x 10^-7 N when the distance between their centres is 10m. If the mass of first body is 800 kg, then the mass of second body is

Moderate

A

1000 kg
B

1250 kg
C

1500 kg
D

2000 kg

Solution

$F_{g} = \frac{{Gm}_{1} m_{2}}{R^{2}} \Rightarrow m_{2} = \frac{F_{g} \times R^{2}}{{Gm}_{1}}$

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