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a laser beam of of 4.60W and a diameter D=2.60 mm is directed

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a laser beam of of 4.60W and a diameter D=2.60 mm is directed upward at one circular face (of diameter d<2.60mm) of perfectly reflecting cylinder. The cylinder is levitated because the upward radiation force matches the downward gravitational force. If the cylinder density is 1.20 g/cm cu. what is it's height?
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Customer: replied 4 years ago.

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