Question

How much will a person with 72 N weight on the earth, weigh on the

moon?

(A) 12 N (B) 36 N (C) 21 N (D) 63 N

The answer is :- (A) 12 N

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Answer 1

Answer:

We know,

g

earth

=

R

2

GM

where, M = mass of planet (earth)

As moon is lighter than the earth i.e, approx

mass of moon =

6

1

(mass of earth)

⇒g

moon

=

R

2

6

GM

=

6

g

earth

Thus, weight of man on moon is

=mg

moon

=

6

mg

earth

=

6

72

=12N

Answer 2

Explanation:

look gravity is 1/6 of earth gravity

so , a person weight on earth =72N

a person weight on moon=72N×1/6

=12N