A student is in the weight room. The student picks up a two pound weight and then decides it is too light. The student then picks up a heavier 20 pound weight. Explain two ways that the student's body can increase the strength of a muscle contraction (tension) to handle the 20 pound weight (as compared to the two pound weight) in this instance.

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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.