Secure l er 2017 next 15) Item 19 Item 19 Part A Approximately 80% of the energy

Question

Secure l er 2017 next 15) Item 19 Item 19 Part A Approximately 80% of the energy used by the body must be To cool the body of ajeggor of mass 100 kg by 18 c.how much sweat has to evaporate? dissipated thermally. The mechanisms available to eliminate this energy are radiation, evaporation of sweat, evaporation from the conduction, and convection In this question. 260 g we wil focus on the evaporation of sweat alone, although all of these mechanisms are needed to survive The Latent heat of vaporization sweat at 140 g 2.42x10 J/kg and the specific heat of a body is Submit My Answers Part B Due to the evaporation of the jogner's sweat the change in entropy of the universe is Not able to be determined with the given information My Answers Submit Part C

Explanation / Answer

Part A )

m X 2.42 X 106 = 100 X 3500 X 1.8

m = 0.2603 kg

m = 260.3 grams

first option is correct

Part B )

in the process of evaporation heat absorbs

so entropy is positive

first option is correct

Part C )

2800000 = m X 2.42 X 106

m = 1.157 kg

Part D )

2800 k J / h

so

3.8 hours

third option correct

Part E )

radiation is correct

Last option is correct

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