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An object in the vacuum of space orbits the earth at a fixed speed in a circular orbit several
hundred miles above the earth. What can we conclude about the reaction force?
a) That there is no reaction force-the net force on the object is zero, so the reaction
force is zero too.
b) The reaction force is a force that acts on the earth directed upward toward the object.
c) There is no reaction force- there’s a net force on the object, but zero reaction force because the
object is out in space.
d) The reaction force is a normal force that acts upward from the Earth’s surface.

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