In the figure here, a box of Cheerios (mass mc = 1.50 kg) and a box of Wheaties (mass mw = 3.00 kg) are accelerated across a horizontal surface by a horizontal force applied to the Cheerios box. The magnitude of the frictional force on the Cheerios box is 2.80 N, and the magnitude of the frictional force on the Wheaties box is 4.50 N. If the magnitude of F is 12.0 N, what is the magnitude of the force on the Wheaties box from the Cheerios box?

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.