The mass of Mars is and its radius is

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

The mass of Mars is

6.42\times10^{23}\,\text{kg}

and its radius is

3.39\times10^{6}\,\text{m}

. Calculate the gravitational potential on the surface of Mars in

\text{MJ\,kg}^{-1}

(take

G = 6.67\times10^{-11}\,\text{N\,m}^{2}\text{kg}^{-2}

). (a)

-25.2\,\text{MJ\,kg}^{-1}

(b)

-12.6\,\text{MJ\,kg}^{-1}

(c)

-6.3\,\text{MJ\,kg}^{-1}

(d)

+12.6\,\text{MJ\,kg}^{-1}