Q.

The earth attracts the moon with a gravitational force of 1020 N. Then the moon attracts the earth with a gravitational force of__


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a

10-20 N

b

102 N

c

1020 N

d

1010 N 

answer is C.

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Detailed Solution

The earth attracts the moon with a gravitational force of 1020 N. Then the moon attracts the earth with a gravitational force of 1020 N.
“The universal gravitational law states that attractive force between two bodies of mass m1 and m2 which are kept at a distance d from each other is directly proportional to the product of masses and it is inversely proportional to the square of the distance in which they are kept.”
i.e., F α m1 m2  and F α 1d2
or, combining these, we may write, F=Gm1 m2d2
where G is the gravitational constant.
When the earth attracts the moon with a force, the moon attracts the earth with the same gravitational force.
 
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