Posted by **janee** on Sunday, December 11, 2011 at 9:40am.

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 -
**drwls**, Sunday, December 11, 2011 at 10:15am
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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