College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300



College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

Small spheres of diameter 1.00 mm fall through 20°C water with a terminal speed of 1.10 cm/s. Calculate the density of the spheres.

To determine
The density of the spheres.

The terminal speed of the spheres is defined as vt=2r2g(ρρf)/9η and now the density of these spheres is obtained by rearranging this expression as ρs=ρw(9ηwvt/2r2g) . Spheres diameter is d=2r and its radius is given by r=r/2 .

Given info: The terminal speed of the spheres is 1.10cm/s , density of water is 1.00×103kg/m3 , diameter of the spheres is 1.00mm , acceleration due to gravity is 9.80m/s2 and viscosity of water is 1.00×103Ns/m2 .

The formula for the density of spheres is,


  • ρw is density of water.
  • ηw is viscosity of water.
  • vt is terminal speed of the sphere.
  • r is radius of the spheres.
  • g is acceleration due to gravity.

Substitute 1.00×103kg/m3 for 1.00×103kg/m3 , 1

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