Giancoli's Physics: Principles with Applications, 7th Edition
10
Fluids
Change chapter10-2: Density and Specific Gravity
10-3 to 10-6: Pressure; Pascal's Principle
10-7: Buoyancy and Archimedes' Principle
10-8 to 10-10: Fluid Flow, Bernoulli's Equation
10-11: Viscosity
10-12: Flow in Tubes; Poiseuille's Equation
10-13: Surface Tension and Capillarity
10-14: Pumps; the Heart
Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 68
Q
Calculate the force needed to move the wire in Fig. 10–34 if it holds a soapy solution (Table 10–4) and the wire is 21.5 cm long.
Figure 10-34 U-shaped wire apparatus holding a film of liquid to measure surface tension ().
A
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VIDEO TRANSCRIPT
This is Giancoli Answers with Mr. Dychko. Surface tension for this apparatus is force divided by 2 times the length of the wire and we'll multiply both sides by 2l and get the force required is 2l times γ. So that's 2 times 21.5 times 10 to the minus 2 meters times 0.025 newtons per meter— surface tension— for a soapy solution and that's gonna be 0.011 newtons.
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