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Find mass of a rope pulled by a force

  • Thread starter Jahnavi
  • Start date
  • #1
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102

Homework Statement


rope.jpg


Homework Equations




The Attempt at a Solution



The force F exerted by the wall on the left end of the rope will make an angle 30° with the vertical . If we do the force balance ,

F sin30° = 20
Fcos30° = Mg

This gives M = 2√3 Kg . This gives 3.5 Kg . But answer given is option 4) . What is the mistake ?

Edit : There is a mistake in the answer key . Correct option is 3) .
 

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Answers and Replies

  • #2
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64
Your force balance is correct, as is your final result.
 

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