Properties of Matter 3 Question 4

10. If the radius of the opening of the dropper is r, the vertical force due to the surface tension on the drop of radius R (assuming r«R ) is

(a) 2πrT

(b) 2πRT

(c) 2πr2TR

(d) 2πR2Tr

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Answer:

Correct Answer: 10. 500

Solution:

  1. From continuity equation

Applying Bernoulli’s theorem at 1 and 2

p2+12ρv22=p1+12ρv12p2=p1+12ρ(v12v22)=(2000+12×103(14))p2=500Pa



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