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D www.google.com Mastering Physics: PS-1-Advanced Google Chrome C O op Secure https://session.masteringphysics.com assignment ProblemID 74171632&offset; next /myct/itemView? PHYS1052 General Physics II es Advanced Problem 16.50 Mastering Phy minute with a 0.35 cm thick layer of air instead of glass G My Courses Problem 16.50 Express your answer using two significant figures. Course Home A glass window 0.35 cm thick measures 86 cm by 36 cm If the inside and outside temperatures Syllabus differ by 12 the heat flows through this window per minute is 53 kJ Assignments 2.3 Scores Submit My Answers Give Up Course Tools Incorrect, Try Again, 5 attempts remaining eText Study Area Part B User Settings By what factor is the rate of heat transfer reduced? Express your answer using two significant figures. 40 Qur/ Submit My Answers Give Up https://session masteringphy Ask me anything kJ/min D X X previous l 5 of 12 l next a NS 949 PM 9/2017

Explanation / Answer

solving first question

for air

k=0.024

Q/t=k*difference in temp*area/thickness

area=0.86*0.36=0.3096 m^2

Q/t=0.024*0.3096*12/(0.35*0.01)=25.48 J/s=1.53 kJ/min

Part B

for glass Q/t is 53000/60=883.33 J/s

reduced by factor=34.66

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