An astronaut stands at a position on the Moon such that Earth is directly over h

Question

An astronaut stands at a position on the Moon such that Earth is directly over head and releases a Moon rock that was in her hand.
(a) Which way will it fall?
-Towards the Earth
-Towards the Moon

towards the earth towards the moon

(b) What is the gravitational force exerted by the Moon on a 1.1-kg rock resting on the Moon's surface?
_________________N

(c) What is the gravitational force exerted by the Earth on the same 1.1-kg rock resting on the surface of the Moon?
______________mN

(d) What is the net gravitational force on the rock?
N towards the earth towards the moon

Explanation / Answer

a. Towards the Moon

b. F = Gm1m2/R^2 = 6.67*10^-11* 7.36*10^22*1.1/1.74^2 *10^12

    F = 1.783 N

C. F = 6.67*10^-11 * 5.98*10^24*1.1/3.82^2 *10^16

       = 3.006 mN

d.   1.7799 N towards mooonremerf and

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