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Physics 1 Problem Solutions 167

Physics 1 Problem Solutions 167 - from the Sun is spread...

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Chapt. 19 Thermodynamics I: Temperature, Heat, First Law 163 c) What is total power received by the Earth from the Sun? (The Earth’s mean radius is 6378 km.) d) The Earth collects sunlight at one time only on one side and because of the curvature of the Earth’s surface the power absorbed varies with the tilt of the surface to the incoming beams. However, rotation and air circulation very crudely can be assumed to evenly spread the power over the whole Earth. Obviously this is not exactly true: the further from the equator the less power is received on average. Let’s assume though that the power received
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Unformatted text preview: from the Sun is spread uniformly over the Earth’s surface. Now the Earth is more or less in an energy steady state. It re-radiates back to space in the infrared virtually all of the energy it gets from the Sun which mostly comes in the optical. Assuming the Earth is a spherical black-body absorber/radiator in an exact energy-steady state, what is its surface temperature? Can the Earth be exactly a black-body absorber/radiator?...
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