Register to reply

Deriving mass of Earth from definition of gravity

by jrw
Tags: derivation, gravity, mass
Share this thread:
Dec4-10, 12:11 PM
P: 7
1. The problem statement, all variables and given/known data
Using the definition of gravity, derive the mass of the Earth

2. Relevant equations
I am unsure if this is simply a plug n chug problem and I am over thinking it or there is some way to use calculus to derive the mass from the gravity equation.

3. The attempt at a solution

I am looking at the equation a=GM(earth)/r^2
I know I can simply find these values in my text book, but I dont see why it would be that simple of a problem. So I just feel like there must be something I am missing.
Phys.Org News Partner Science news on
'Smart material' chin strap harvests energy from chewing
King Richard III died painfully on battlefield
Capturing ancient Maya sites from both a rat's and a 'bat's eye view'
Dec4-10, 12:32 PM
P: 2,195
I don't think you're missing anything. Plug-n-chug away!
Dec4-10, 12:34 PM
P: 7
Quote Quote by phyzguy View Post
I don't think you're missing anything. Plug-n-chug away!
awesome thank you :D

Register to reply

Related Discussions
Less gravity on Earth when Dinosaurs roamed because all mass in universe was closer? General Physics 9
Deriving Resonant Frequency of Multiple Mass Mass-Spring Systems Introductory Physics Homework 1
Is gravity affected by mass on the earth? General Physics 18
Gravity on mass on earth's surface vs sun-earth gravity Introductory Physics Homework 2
Problems - Gravity & Mass of Earth & Moon Introductory Physics Homework 4