An athlete has a basal metabolic rate of 70.0 W. As she is working out, her metabolic rate increases by about 600 W. She eats one piece of buttered toast for breakfast, which has 145 Calories. She wants to work off the piece of toast.
-How long will it take if she works out?

Question

Quizplus · Accepted Answer

The energy from the toast is 145 Calories, which is equivalent to 145 kcal. Since 1 kcal = 4184 J, the energy from the toast is 145 * 4184 J = 606,680 J. The athlete's total metabolic rate while working out is 70 W (basal) + 600 W (increase) = 670 W. To find out how long it will take to work off the toast, divide the total energy by the power (rate of energy expenditure), which gives 606,680 J / 670 W = 905.49 seconds. Converting seconds to minutes, 905.49 seconds / 60 = 15.1 minutes.

An Athlete Has a Basal Metabolic Rate of 70