# physics

posted by .

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.

• 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.

## Similar Questions

1. ### Physics

A satellite has a mass of 6146 kg and is in a circular orbit 4.57 × 105 m above the surface of a planet. The period of the orbit is 1.6 hours. The radius of the planet is 4.44 × 106 m. What would be the true weight of the satellite …
2. ### Physics

A 21.0-kg satellite has a circular orbit with a period of 2.37 h and a radius of 8.50×106 m around a planet of unknown mass. If the magnitude of the gravitational acceleration on the surface of the planet is 7.10 m/s2, what is the …
3. ### Physica

A 21.0-kg satellite has a circular orbit with a period of 2.37 h and a radius of 8.50×106 m around a planet of unknown mass. If the magnitude of the gravitational acceleration on the surface of the planet is 7.10 m/s2, what is the …
4. ### physics help 3!! **

Based on the following data about planet X (which orbits around the Sun): Planet X's distance from Sun = 3.6*1012 m Planet X's radius = 2*106 m Planet X's mass = 8.2*1022 kg a.) Find gx, the size of the acceleration due to gravity …
5. ### physics

An object rests on the surface of planet y. Its mass is unknown. Find the acceleration due to gravity near the surface of planet y. Answer in m/s/s. G=6.673x10^-23 radius of planet y=2439700m mass of planet y=3.302x10^23kg radius of …
6. ### Physics

A simple pendulum has a period T on the surface of planet Earth. When taken to the surface of planet X, the same pendulum has a period 2T. a) If the radius of planet X is 1/2 the radius of Earth, what is the mass of Planet X, relative …
7. ### physics

A 2.5 kg mass weighs 23.75 N on the surface of a planet similar to Earth. The radius of this planet is roughly 7.7 × 10^6 m. Calculate the mass of of this planet. The value of the universal gravitational constant is 6.67259 × 10^−11N …
8. ### physics

A 2.5 kg mass weighs 23.75 N on the surface of a planet similar to Earth. The radius of this planet is roughly 7.7 × 10 6 m.Calculate the mass of of this planet. The value of the universal gravitational constant is 6.67259 × 10−11N …
9. ### Physics

Astronomers can calculate the mass of a planet by using the orbital parameters of one of its moons. Consider a hypothetical planet, which has a hypothetical moon that orbits the planet in a roughly circular orbit with a radius of 3.95*10^8 …
10. ### physics

A 4 . 7 kg mass weighs 39 . 95 N on the surface of a planet similar to Earth. The radius of this planet is roughly 6 . 2 × 10 6 m. Calculate the mass of of this planet. The value of the universal gravitational constant is 6 . 67259 …

More Similar Questions