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A Soap Film of surface tension 0.03N\m formed in rectangular frame , can support a straw . The length of the film is 10cm. mass of the straw the film can support is ???

A Soap Film of surface tension 0.03N\m formed in rectangular frame , can support a straw . The  length of the film is 10cm.  mass of the straw the film can support is ???

Grade:11

1 Answers

Vikas TU
14149 Points
2 years ago
The weight of straw will be balanced by the force of surface tension.
Let the mass of straw is m, then
mg = 2Tl 
m = 2Tl/g  
m = 0.6g 

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