physics

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A 3.3 kg mass weighs 30.03 N on the surface
of a planet similar to Earth. The radius of
this planet is roughly 7.4 × 106 m.
Calculate the mass of of this planet. The
value of the universal gravitational constant
is 6.67259 × 10−11 N · m2/kg2.
Answer in units of kg

  • physics -

    Solve this equation for M:

    30.03 = G M*m/R^2
    = G * M*3.3/(7.4*10^6)^2

    where G is the universal graitational constant, 6.67^10^-11.

    You should only keep two or three significant figures in the answer, since they have only given you a "rough" R value.

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