How many joules of solar energy fall on your back while you work on your tan for 0.70h?
The intensity of electromagnetic waves from the sun is 1.4 m ^ / kW 2 just above Earth's atmosphere. Eighty percent of it reaches the surface at noon on a beautiful summer day. Suppose you model the back like a rectangle of 27cm and 51cm. How many joules of solar energy falling on back while you work on your tan for 0.70h?
80% 1.4 = 1.12 kW / m = 0.27 * 0.51 = 0.138 = 1.12 m = 0.138 * Power 0.154 kilowatts of energy = Power * Time = 0.7 * 3600 = 2520 = 0.154 seconds of energy * 2520 = 389 Joules
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