Determine the magnitude of the minimum acceleration

  • #1

Homework Statement



A 76-kg petty thief wants to escape from a third-story jail window. Unfortunately, a makeshift rope made of sheets tied together can support a mass of only 58 kg.Determine the magnitude of the minimum acceleration at which the thief can descend using the rope.

Homework Equations



i think T-mg=ma?

The Attempt at a Solution


i know tension would be the upward force and mg (weight) would be the upward force correct?
 

Answers and Replies

  • #2
haruspex
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The signs are going to depend on how you define the positive direction. Your equation is fine if the aceleration a is defined upward (so expect a negative result).
 
  • #3
The signs are going to depend on how you define the positive direction. Your equation is fine if the aceleration a is defined upward (so expect a negative result).
would i use the mass of the man or the mass that the sheet can with stand?
 
  • #4
haruspex
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would i use the mass of the man or the mass that the sheet can with stand?
The question is not quite right. It should say that the sheets can withstand a weight of 58g N. Mass is not force.
 
  • #5
arildno
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What would the tension be if a man of 58 kg chose to rest from it?
 

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