(adsbygoogle = window.adsbygoogle || []).push({}); 1. A newly found planet with a density of 4950 kg/m3 has no atmosphere and is orbited by a low altitude satellite with an orbital speed of 3.55 km/s. What is the mass of the planet?

2. density*velocity=mass

G= 6.67E-11

3. After a process of equations, I ended up with mass= sqrt(V^6)/(G^3*density*4/3*pi). Subbing in the values and converting 3.55 km/s to 3550 m/s, I get sqrt(3550^6)/(6.67E-11)^3(4950)(4/3*3.14) to get an answer of 3.3*10^47 kg

This isn't the right answer, and I'm not sure where I screwed up. Much appreciated..

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Mass of a planet?

**Physics Forums | Science Articles, Homework Help, Discussion**