Item 8 Part A If he couldnt perspire or otherwise cool his bodyby how much would
ID: 1771579 • Letter: I
Question
Item 8 Part A If he couldnt perspire or otherwise cool his bodyby how much would his body temperature rise during this exercise? It is important for the body to have mechanisms to effectively cool itselfif not, moderate exercise could easily increase body temperatures to dangerous levels. Suppose a 70 kg man runs on a treadmill for 21 min, using a metabolic power of 1000 W. Assume that all of this power goes to thermal energy in the body. Express your answer using two significant figures. sh r OD ? You may want to review (ages 376-379) AT = 6.15 Submit My Answers Give Up Incorrect; Try Again; 5 attempts remaining Continue Provide FeedbackExplanation / Answer
ANSWER :-
Item 8 :-
Given m = 70 kg ,
Metabollic power Q = 1000w in 21 min = 1000 * 21 *60
P = mc dT / t
dT = Pt / mc
dT = (1000W) * (21 min * 60 s) / (70kg * 3470J/kg)
dT = 5.2 degree Celusis
ANSWER
ITEM 9 :-
Internal energy of a gas is directly proportional to absolute temperature.
U1 / U2 = T1 /T2
given T1 = 25 + 273 = 298 K
U2 = U1 - (25/100) *U1
U2 = 0.75 U1
U1 /U2 = T1/ T2
U1/ 0.75U1 = 298 / T2
T2 = 298 * 0.75
T2 = 223.5 K
t2 = 223.5 -273
t2 = -49.5 Degree celsius.
ANSWER
Item 1 :-
Since this is isochoric expansion, not adiabatic, we can say:
P1 / T1 = P2 / T2
We have P1 = 56.3 KPa T1 = 273 deg Kelvin, P2 = 66.9 KPa
T2 = (P2 * T1 ) / P1
= (66.9 * 273) / 56.3
= 324.4 K
.= 324.4 - 273
T2 = 51.4 deg celsius
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