Question

9.  The Earth attracts the moon with a gravitational force of 10 20 N The moon attracts the earth with a gravitational force of

Answer 1

Answer:

By Newton's Third Law and Newton's Law of Universal gravitation, the gravitational force the Earth exerts on the Moon is exactly the same as the force the Moon exerts on the Earth. Therefore, the moon attracts the earth with a gravitational force of 1020N.

Explanation:

Answer 2

Given:

• The Earth attracts the moon with a gravitational force of 10²⁰ N.

To find:

• Moon attracts earth with what force ?

Calculation:

As per Newton's Law of Gravitation:

$F = \dfrac{G(m1)(m2)}{ {d}^{2} }$

Now, the gravitational force between earth and moon will be :

$\implies F = \dfrac{G(m_{e})(m_{m})}{ {d}^{2} }$

• This value is provided as 10²⁰ N.

$\implies F = \dfrac{G(m_{e})(m_{m})}{ {d}^{2} } = {10}^{20} N$

Now, when the earth is pulling moon with 10²⁰ N force, as per NEWTON'S 3RD LAW OF MOTION, the moon is also pulling earth with 10²⁰ N.

So, moon pulls earth with 10²⁰ N force .