SOLUTION: A circular solar cell must deliver 18 watts of energy. If each square centimeter of the cell that is in the sunlight produces 0.01 watt of energy, how long must the radius of the c

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Question 730091: A circular solar cell must deliver 18 watts of energy. If each square centimeter of the cell that is in the sunlight produces 0.01 watt of energy, how long must the radius of the cell be?
Please help me, I'm having a head ache just looking at the question. If you can, please explain how to do the question. Thank you so much!!
Answer by Alan3354(69443) (Show Source):
You can put this solution on YOUR website!
A circular solar cell must deliver 18 watts of energy. If each square centimeter of the cell that is in the sunlight produces 0.01 watt of energy, how long must the radius of the cell be?
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18 W/0.01 W/sq cm = 1800 sq cms
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A = pi*r^2 = 1800
cm
r =~ 23.94 cm
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PS Watt is not a unit of energy, it's a unit of power.
The solar cell's output is measured in watts, a measure of power.
Joules are energy. 1 Watt*second = 1 Joule