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Suppose the average intensity of the solar radiation that strikesnormally on a surface just outside Earth's atmosphere is 1.6 kW/m2.(It is actually 1.4 kW/m2.) (a) What would be the radiationpressure pr exerted on this surface, assuming complete absorption?(b) For comparison, find the ratio of pr to Earth's sea-levelatmospheric pressure, which is 1.0 x 105 Pa.
Suppose the average intensity of the solar radiation that strikesnormally on a surface just outside Earth's atmosphere is 1.6 kW/m2.(It is actually 1.4 kW/m2.) (a) What would be the radiationpressure pr exerted on this surface, assuming complete absorption?(b) For comparison, find the ratio of pr to Earth's sea-levelatmospheric pressure, which is 1.0 x 105 Pa.
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Deanna HettingerLv2
11 Jan 2019
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A solar sail allows a spacecraft to use radiation pressure for propulsion, similar to the way wind propels a sailboat. The sails of such spacecraft are made out of enormous reflecting panels. The area of the panels is maximized to catch the largest number of incident photons, thus maximizing the momentum transfer from the incident radiation.
For such spacecraft to work, the force from the radiation pressure exerted by the photons must be greater than the gravitational attraction to the star emitting the photons. The critical parameter is the area density (mass per unit area) of the sail.
To solve the second part of this problem you will need to know the following:
Isun(R) = 3.2 x10251/R2 (W/m2)
and
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I'm having trouble figuring out how to slovepart B.Thanks!