Someone plans to float a small, totally absorbing sphere 0.522 m above an isotropic point source of light, so that the upward radiation force from the light matches the downward gravitational force on the sphere. The sphere's density is 20.8 g/cm, and its radius is 2.20 mm. (a) What power would be required of the light source? (b) Even if such a source were made, would the support of the sphere be unstable? Assume that the speed of light is 2.998*108 m/s.
Someone plans to float a small, totally absorbing sphere 0.522 m above an isotropic point source of light, so that the upward radiation force from the light matches the downward gravitational force on the sphere. The sphere's density is 20.8 g/cm, and its radius is 2.20 mm. (a) What power would be required of the light source? (b) Even if such a source were made, would the support of the sphere be unstable? Assume that the speed of light is 2.998*108 m/s.
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Someone plans to float a small, totally absorbing sphere 0.522 m above an isotropic point source of light, so that the
upward radiation force from the light matches the downward gravitational force on the sphere. The sphere's density is 20.8
g/cm, and its radius is 2.20 mm. (a) What power would be required of the light source? (b) Even if such a source were
made, would the support of the sphere be unstable? Assume that the speed of light is 2.998*105 m/s.
(a) Number
Units W
307000000000
(b)
Yes
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