C Spire LTE 7:17 PM esession.masteringphysics.com ¢ C Exercise 11.1 MasteringPhy
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Question
C Spire LTE 7:17 PM esession.masteringphysics.com ¢ C Exercise 11.1 MasteringPhysics 2 of 9 C Exercise 11.11 all temperatures to be Assume all temperatures to be exact. A modern engine of alloy construction consists of 29 kg of aluminum and 68 kg of iron. Part A How much heat does the engine absorb as its temperature increases from 18 °C to 10 C as it warms up to operating temperature? Express your answer using two significant figures. Q= 4.87. 106 Submit Give Up Incorrect; Try Again; 5 attempts remaining Continue>
Explanation / Answer
specifuc heat capacity of aluminium is S1 = 900 J/kg-K
specifuc heat capacity of iron is S2 = 444 J/kg-K
specifuc heat capacity of glass is S3 = 840 J/kg-K
heat absorbed by engine = heat emitted by iron + aluminium
Q = Q1+Q2 = ((m1*S1)+(m2*S2))*dT = ((29*900)+(68*444))*(110-18) = 5.17*10^6 J
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heat gained by glass cup = heat lost by hot water
0.17*840*(T-27) = 0.46*4186*(80-T)
T = 76.4 degrees celsius
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