using focused laser light, optical tweez

Question

using focused laser light, optical tweezers can apply a force of about 10 pn to a 1.0-/un diameter polystyrene bead, which has a density about equal to that of water: a volume of 1.0 cm3 has a mass of about 1.0 g. estimate the bead’s acceleration in g’s.

Answer 1

a/g is what you want.

Acceleration a = f/m,

mass m = ρv,

and volume v = 4πr³/3.

You know force f, density ρ, and radius r = d/2 from the question, and can look up gravitational acceleration g.