The earth exerts the necessary centripetal force on an orbiting satellite to keep it moving in a circle at constant speed. which one of the following statements best explains why the speed of the satellite does not change although there is a net force exerted on it?
a) the satellite is in equilibrium.
b) the acceleration of the satellite is zero m/s2 .
c) the centripetal force has magnitude mv2 /r.
d) the centripetal force is canceled by the reaction force.
e) the centripetal force is always perpendicular to the velocity.
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