The bicep curl is an exercise where you lift up a barbell with weight attached by bending of your arms. How much energy does it take to curl a barbell with a total weight of 69.9 lb if you bend your arms through 180 ^o (straight down to straight up)? Assume your forearm length (elbow to hand) is 0.543 m, and the weight is at rest at start and end of the motion.

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