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Suppose that the Earth acts as a blackbody of radius 6.4 × 106 m and effective temperature 240 K. (This is not the same as our surface temperature, due to our atmosphere's intervention. Most outgoing infrared ultimately leaves from the upper atmosphere.)
(a) What is the flux of energy leaving the Earth's surface for outer space?
(b) What is the total rate of emission of energy by the entire Earth?
(c) The flux of sunlight sweeping through space at our position is 1.4 kW/m2. Earth's temperature remains constant on the average. What fraction of the incident solar radiation is absorbed by the Earth? (Caution: The area intercepting the sunlight is not the same as the total area of the Earth that emits.)
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a satellite is in a circular orbit 250 mi above the surface of the earth. determine the new perigee and apogee
determine the rate of diffusion of cu in al at 300k using d do exp -edrt where do 0.15 cm2sec and ed 125 kjmole.
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Determine the angular velocity and angular acceleration of rod AC at this instant.
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