Posted by **Maggie** on Sunday, November 22, 2009 at 12:44pm.

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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