Physics

The sun outputs 1380 W/m^2 of energy at the earth's surface. A small rectangular las has the following dimensions: 1km wide, 1.4km long, and 300m deep

A) Calculate the thermal energy added to the lake if exposed to 12h of direct sunlight.

B) calculate the increase in temperature of the lake, assuming the temperature is even throughout.


Can someone please help me with both A & B please :)

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asked by Sandara
  1. Q =q•W•L•t= 1380•1000•1300•12•3600= =7.75•10¹³ J
    Q=cmΔT
    ΔT= Q/cm = Q/cρV=7.75•10¹³/4180•1000•1000•1300•300=
    =0.048 K

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    posted by Elena

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