Question

An astronaut weight700N on earth what is the best approximately of his new weight on planet with radius that is two times that of earth and mass three times that of earth

Answer 1

Answer:

Correct option is A)

The gravitational acceleration on earth's surface is g=

R

2

GM

For planet, M

p

=M/7 and R

p

=R/2

So, g

p

=

R

p

2

GM

p

=

(R/2)

2

G(M/7)

=

7

4

g

Thus, weight of the body on planet's surface =700g

p

=700(4/7)=400N