Lasers have been used to suspend spherical glass beads in


Lasers have been used to suspend spherical glass beads in the Earth's gravitational field.

(a) A black bead has radius r and density r. Determine the radiation inten- sity needed to support the bead.

(b) What is the minimum power required for this laser?

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Physics: Lasers have been used to suspend spherical glass beads in
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