A how long will the energy in a 310 kcal cup of yogurt last, Ask an Expert

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(a) How long will the energy in a 310 kcal cup of yogurt last in a woman doing work at the rate of 130 W with an efficiency of 20.0% (such as in leisurely climbing stairs)?

(b) Does the time found in part (a) imply that it is easy to consume more food calories than you can reasonably expect to work off with exercise?

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