Question

a boy of mass 40 kg . if the pull of gravity on 1kg on the surface of Earth is 9.8 N at the surface of moon is 1.6 N find (a) the weight of boy at the earth's surface (b) mass and weight of the boy at the moon's surface ​

Answer 1

Answer:

Explanation:

Weight of boy at Earth =mg=40*9.8=39.2N

Mass of boy on moon= 40 kg (since Mass is constant everywhere)

Weight of boy on moon =40*1.6=6.4N

Answer 2

Answer:

(a) Weight of the boy at earth's surface = 392 N

(b) Weight of the boy at moon's surface = 64 N

    Mass of the boy at the moon's surface is = 40 kg

Explanation:

As per the question,

Given data are:

Mass of boy, m = 40 kg

Value of g at earth's surface = 9.8 N

Value of g' at moon's surface = 1.6 N

(a) Weight of the boy at earth's surface is given by = mg

Therefore,

Weight of the boy at earth's surface = 40 × 9.8 = 392 N

(b) Weight of the boy at moon's surface is given by = mg'

Therefore,

Weight of the boy at moon's surface = 40 × 1.6 = 64 N

And,

Mass of the boy at the moon's surface is = 40 kg

( Since mass of any object is independent of the gravity pull, that's why it is constant.)