A contractor lifts beams (985 kg) 52 m using a 10 hp-rated crane. Convert 10 hp to Watts (use 1 hp = 746 W) and calculate the available power to lift %3D the beams if only HALF of the rated power is used (that is, the crane is operated at half-capacity). Then use this information to determine how much time it takes to lift each beam, rounded to the nearest second.

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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.