# physics

A 735 N person walks up three flights of stairs, covering a total vertical distance of 10.0 m. If, as is typical, only 20.0% of the caloric (food) energy is converted to work by the muscles, how many joules and food calories of energy did the person use? (One food calorie 4186 J.)

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1. Five times the energy needed to climb the stairs. That would be 5 x 735 x 10 Joules.

Convert that to food calories using the conversion factor provided.

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