Question

Question #6db4b

Answer 1

Weight of a man on moon surface will be `W/5`,
where `W` is his weight on Earth.

Explanation:

The weight of a body on any planet is the gravitational force between a planet and a body calculated by the formula
`W=gamma*(M_b*M_p)/R^2`
where
`gamma` is a gravitational constant,
`M_b` is a mass of a body,
`M_p` is a mass of a planet,
`R` is the distance between the center of a planet and a center of a body (which for all intents and purposes should be taken as the radius of a planet)

If we decrease `M_p` by a factor of `80` and decrease `R` by a factor of `4`, the gravitational force will change by a factor of `4^2/80=1/5`.