Question

Mars has a radius of 3,390 km and a mass of 6.39 x 1023 kg.

a) What is the gravitational field strength on Mars?

b) How much would a 80kg person weigh on Mars?

 

 

 

 

 

 

 

 

Answer 1

a)

$g=G\frac{M}{R^2},$

$g=6.67\cdot 10^{-11}\cdot \frac{6.39\cdot 10^{23}}{3.39^2\cdot 10^{12}}=3.71~\frac{N}{kg},$

b)

$P=mg,$

$P=3.71\cdot 80\approx300~N.$