Fluid Mechanics Viscosity Question 132
Question: The maximum force, in addition to the weight required to pull a wire of 5.0 cm long from the surface of water at temperature $ 20{}^\circ C $ is 728 dynes. The surface tension of water is
Options:
A) $ 7.28,N/cm $
B) $ 7.28,dyne/cm $
C) $ 72.8,dyne/cm $
D) $ 7.28\times 10^{2},dyne/cm $
Show Answer
Answer:
Correct Answer: C
Solution:
[c] $ T=\frac{F}{2l}=\frac{728}{2\times 5} $ $ \therefore T=72.8dyne/cm $
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