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Question: A flea is able to jump about


A flea is able to jump about 0.5 m. It has been said that if a flea were as big as a human, it would be able to jump over a 100 - story building! When an animal jumps, it converts work done in contracting muscles into gravitational potential energy (with some steps in between). The maximum force exerted by a muscle is proportional to its cross - sectional area, and the work done by the muscle is this force times the length of contraction. If we magnified a flea by a factor of 1000, the cross section of its muscle would increase by 10002 and the length of contraction would increase by 1000. How high would this “superflea” be able to jump? (Don’t forget that the mass of the “superflea” increases as well.)

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