When you drink cold water, your body must expend metabolic energy is order to ma

Question

When you drink cold water, your body must expend metabolic energy is order to maintain normal body temperature (370 C) by warming up the water in your stomach. Could drinking ice water, then, substitute for exercise as a way to "burn calories"? Suppose you expend 320 kilocalories (320 food Calories) during a brisk walk. How many gallons of ice water (at 0° C) would you have to drink in order to burn 320 kilocalories? Note that 1.0 kcal = 4186 Joules. Suppose you are trying to decide whether to burn Calories by drinking cold water or climbing stairs. If each stair is 15 cm in height, how many stairs would you need to climb to burn the same number of kilocalories as drinking 1.0 Liter of ice water? Assume you havea mass of 65 kg. a) b)

Explanation / Answer

a) Q- = mC delta T

320 x 4186 J = m ( 4181 ) ( 37-0)

m = 8.66 kg apprx

b) 1( 4181) ( 37) = n 65(9.8) (0.15)

n =1619 steps apprx

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