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AP Physics C: Mechanics 2.10.B Circular Orbits & Kepler’s Third Law

Practise deriving circular-orbit relationships by equating gravitational and centripetal forces, then use Kepler’s third law to compare orbital periods and radii.

Syllabus
Effective Fall 2024
Course
AP Physics C: Mechanics

Exam points

  • Equate gravitational and centripetal forces to derive a satellite’s orbital speed.
  • Apply T² ∝ r³ to compare the periods and radii of circular satellite orbits.

2.10.B—Describe circular orbits using Kepler’s third law question 1

[Maximum number: 1]

An Earth satellite in a circular orbit of radius R has a period T. What is the period of an Earth satellite in a circular orbit of radius 4 R ?

A

T

B

2 T

C

4 T

D

6 T

E

8 T

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