By definition, power is just the rate of change of energy with time, so we can write the following equation:

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From the givens, we know the following:ΔE = 150 MJΔt = 1 hour = 3600 sec.

You are watching: At midday, solar energy strikes the earth with an intensity of about 1 kw/m2.

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Replacing (3) in (1), and solving for A, we get:A = 41.67 m² , which is the area of a solar collector that could collect 150MJ of energy in 1 hour, as needed.


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