A satellite in circular orbit around the Earth moves at constant speed. This orbit is maintained by the force of gravitybetween the Earth and the satellite, yet no work is done onthe satellite. How is this possible?(a) No work is done if there is no contact between objects.(b) No work is done because there is no gravity in space.(c) No work is done if the direction of motion isperpendicular to the force.(d) No work is done if objects move in a circle.

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Chapter7: Work And Kinetic Energy
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Problem 84AP: A cart is pulled a distance D on a flat, horizontal surface by a constant farce F that acts at an...
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 A satellite in circular orbit around the Earth moves at constant speed. This orbit is maintained by the force of gravity
between the Earth and the satellite, yet no work is done on
the satellite. How is this possible?
(a) No work is done if there is no contact between objects.
(b) No work is done because there is no gravity in space.
(c) No work is done if the direction of motion is
perpendicular to the force.
(d) No work is done if objects move in a circle.

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