Register to reply

Kepler's Law vs Newton's Amendment

by scottshannon
Tags: amendment, kepler, newton
Share this thread:
Feb6-12, 12:40 PM
P: 2
Hello ..I have a question which I am sure is easy to answer. It has been a long time since I had physics. In a youtube video located here:

She writes a relationship at 4 min which is


Could someone tell me how she gets that? Thank you in advance.....
Phys.Org News Partner Physics news on
Physicists unlock nature of high-temperature superconductivity
Serial time-encoded amplified microscopy for ultrafast imaging based on multi-wavelength laser
Measuring the smallest magnets: Physicists measured magnetic interactions between single electrons
Doc Al
Feb7-12, 01:41 PM
Doc Al's Avatar
P: 41,310
Quote Quote by scottshannon View Post
She writes a relationship at 4 min which is

That comes from the definition of center of mass. Perhaps her notation is confusing you. She uses 'dm' to represent the distance from the center of mass to the small mass m; d(M) represents the large mass M times the distance between the masses d.

Register to reply

Related Discussions
Kepler's 3rd Law vs. Newton's second for Satellite... Introductory Physics Homework 8
Newton's Variation of Kepler's third law Introductory Physics Homework 1
Kepler and Newton Introductory Physics Homework 6
ACK! Kepler's 3rd + Newton Introductory Physics Homework 8
Amendment to Newton 1 General Physics 5