A 0.7-kg object moves in a horizontal circular track with a radius of 3.7m. An external force of 1.2 N, always tangent to the track , causes the object to speed up as it goes around. The work done by the external force as the object makes one revolution is equal to what value in Joule? Only give the numerical value and don't include the unit.

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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.