At room temperature,a typical person loses energy to the surroundings at the rate of 62 W.If this energy loss has to be made up by an equivalent food intake,how many kilocalories (food calories)does this person need to consume every day just to make up this heat loss? (1 cal = 4.186 J)
A)1000 kcal
B)1100 kcal
C)1300 kcal
D)1500 kcal
E)1600 kcal

Question

Quizplus · Accepted Answer

The energy loss per second is 62 J/s. To convert this to calories per day, we can use the conversion factor:

1 cal = 4.186 J

So, the energy loss per day is:

62 J/s x 86,400 s/day = 5,356,800 J/day

To convert this to kilocalories, we divide by 1000:

5,356,800 J/day ÷ 1000 cal/kcal ÷ 4.186 J/cal = 1279 kcal/day

Rounding to the nearest hundred gives us 1300 kcal/day, which is closest to choice C.

At Room Temperature,a Typical Person Loses Energy to the Surroundings