If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

Course: High school physics - NGSS > Unit 2

Lesson 1: Newton's law of universal gravitation
Science
High school physics - NGSS
Types of interactions
Newton's law of universal gravitation
© 2024 Khan AcademyTerms of usePrivacy PolicyCookie Notice

Understand: Newton’s law of universal gravitation

Google Classroom
You might need: Calculator

Problem

The gravitational force between a pair of identical twins who each have a mass of 75.6 kg is 6.126×10−10N.
Calculate the distance between the twins.
Write your answer using three significant figures.
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi
m