MasteringPhysics:UPS17 MP3 Google Chrome Secure I https://sessionmasteringphysic

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MasteringPhysics:UPS17 MP3 Google Chrome Secure I https://sessionmasteringphysics.com/myct/temView?assignmentProblemIDs77124251 niversity Physics at FDU signed in as brianna thomas Help l Close 17-MP3 Problem 20.29 previous l 1 of 7 next Problem 20.29 Part A How many joules of solar energy fall on your back as you work on your tan The intensity of electromagnetic waves from the sun is 1.4 kW /m? just above the earth's for 0,700 hr atmosphere. Eighty percent of this reaches the Express your answer with the appropriate units. surface at noon on a clear summer day. Suppose you think of your back as a 27.0 cm x 48.0 cm rectangle Value Units Submit My Answers Give up Continue

Explanation / Answer

We have two equations,

Power= Energy/time ---------------(1)

Intensity = power/Area ------------(2)

From (1) and (2),

Energy = power*time

Energy = intensity*area*time ---------------(2)

Plugging data given,

Energy = (1.4*10^3)*(0.27*0.48)*(0.7*3600s) = 4.57*10^5 J

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