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Math Help - Gravitational Potential Energy in General

  1. #1
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    Gravitational Potential Energy in General

    "The Moon (m=7.35x10^22 kg) is a natural satellite of Earth (m=5.98x10^24 kg), which has an average distance from Earth's centre of 3.85x10^8 m.

    What is the Moon's kinetic energy and speed while in orbit around Earth?"

    I've solved for the Moon's kinetic energy (found it to be 3.82x10^28 J) which got the same answer for in the book.

    How do I solve for the speed while in orbit? The book gives the answer 1.02x10^3 m/s.

    Any help is appreciated.
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  2. #2
    MHF Contributor Mathstud28's Avatar
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    Quote Originally Posted by Jeavus View Post
    "The Moon (m=7.35x10^22 kg) is a natural satellite of Earth (m=5.98x10^24 kg), which has an average distance from Earth's centre of 3.85x10^8 m.

    What is the Moon's kinetic energy and speed while in orbit around Earth?"

    I've solved for the Moon's kinetic energy (found it to be 3.82x10^28 J) which got the same answer for in the book.

    How do I solve for the speed while in orbit? The book gives the answer 1.02x10^3 m/s.

    Any help is appreciated.
    Ke=\frac{1}{2}mv^2 where m and v are the usual mass and velocity..imput your values solve for v
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