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Old Dec 14th 2009, 03:29 PM   #1
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Radiation Pressure

In the figure, a laser beam with power equal to 4,60 W and diameter of 2,60 mm is shown a circular face (diameter d < 2,60 mm) of a perfectly reflecting cylinder that is suspended in the air by action of radiation pressure exerted by the beam. The density of the cylinder is 1,20g/cm^3. What is the height H of the cylinder?

Figure:
Imageshack - imagemnte
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Old Dec 15th 2009, 06:13 AM   #2
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i think there will be a mom transfer 2U/c.
(2U/c)A= density * A H g
WHERE U=power per unit area of beam
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