Question

John was sleeping in his bedroom. His body uses energy at a rate of 79.8 W. How many calories (C) are used during a 6.0-hour period? 1 C = 4186 joules.

Answer 1

411 C

Step-by-step explanation:

Energy = 79.8 W x 6.0 h

Energy = 478.8 Wh (watt-hours)

convert watt-hours to joules

1 Wh = 3600 J (joules)

Energy = 478.8 Wh x 3600 J/Wh

Energy = 1723680 J (joules)

convert joules to calories

1 C = 4186 J

Energy = 1723680 J / 4186 J/C

Energy = 411.77 C (calories)