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The food that the average American consumes in a day provides 2.0 X 10^3 kcal of energy. How many calories a sec is this? how to set up work in dimensional analysis? & what is "k" in kcal stand for?

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k is 1000, as in
kg, km, etc.

2.0*10^3kcal/day * 1day/86400s * 1000cal/kcal = 23.15 cal/s

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