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Suppose you have a car with a 125-hp engine. How large a solar panel would you need to replace the engine with solar power? Assume that the solar panels can utilize 20% of the maximum solar energy that reaches the Earth's surface (1000W/m2). 1 hp = 746 W.
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Let the Area required for the Solar Panel = A m^2

Therefore

Area*Efficiency*Energy reseived = Power required = 125 hp

But 1hp = 746 W

Therefore

(20/100)*1000*A = 125*746

A = 466.25 m^2
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