Solar heating takes advantage of solar collectors such as the type shown in Fig. 11.22. During daylight hours, the average intensity of solar radiation at the top of the atmosphere is about 1400 W/m2. About of this radiation reaches the Earth during daylight hours. (The rest is reflected, scattered, absorbed, and so on.) How much heat energy would be received, on average, by the cylindrical collector shown in the figure during 10 h of day-light?

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4.0 m r # 0.5