Question

Chapter 33, Problem 023 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 21.2 g/cm3, and its radius is 2.16 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 (a) Number Units the tolerance is +/-3% Show Work is REQUIRED for this question:

Answer 1