A totally reflecting disk has radius 8.00 mm and averagedensity 600 kg/m3. A laser has an average power output Pav spread uniformlyover a cylindrical beam of radius 2.00 mm. When the laser beamshines upward on the disk in a direction perpendicular to its flat surface,the radiation pressure produces a force equal to the weight of the disk.(a) What value of Pav is required? (b) What average laser power is requiredif the radius of the disk is doubled?

Principles of Physics: A Calculus-Based Text
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ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
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Chapter24: Electromagnetic Waves
Section: Chapter Questions
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A totally reflecting disk has radius 8.00 mm and average
density 600 kg/m3. A laser has an average power output Pav spread uniformly
over a cylindrical beam of radius 2.00 mm. When the laser beam
shines upward on the disk in a direction perpendicular to its flat surface,
the radiation pressure produces a force equal to the weight of the disk.
(a) What value of Pav is required? (b) What average laser power is required
if the radius of the disk is doubled?

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