Which of the following is an application of the universal law of gravitation?

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To determine the masses of the sun, the earth and the moon

In discovering new stars and planets

Both 1 and 2

None of these

answer is C.

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Detailed Solution

One can use the universal law of gravitation to calculate the masses of the sun, earth, and moon. Additionally, it aids in the discovery of new stars and planets.
According to the Universal law of gravitation, the force of attraction between two bodies is given as

F = \frac{G m_{1} m_{2}}{r^{2}}

where, G is the gravitational constant and

G = 6.67 \times 10^{- 11} N m^{2} / k g^{2}

.
To calculate the masses of the sun, moon, and earth, one must apply the general law of gravitation. Any unknown gravitational force experienced by a planet indicates the presence of a celestial body nearby the planet. Hence it aids in the discovery of new planets and stars.

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