Question

If the radius of earth is 6370 km and of mars is 3400 km .if an objects weighs 200 N on earth ,whalt will be its weight on mars if its radius is 0.11 km that of earth.

Answer 1

the gravitational force on earth is mg = m×(G×M)/R = 200N
that on Mars is m×(G×M')/R'
where M = mass of earth
M' = mass of Mars
R = radius of earth
R' = radius of Mars
so from the first equation we can get value of m×G = 200R/M
putting the value in equation 2
force = 200× R/R' × M'/M
force = 965.9 or approx 966N