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you pull up a 75 N bucket using a fixed pulley. the rope does not stretch, so the effort and resistance are the same. however you must exert an 80 N force because of friction. find the efficiency.
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you pull up a 75 N bucket using a fixed pulley. the rope does not stretch, so the effort and resistance are the same. however you must exert an 80 N force because of friction. find the efficiency.

User Rory Alsop
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1 Answer

3 votes

Answer: 94% efficiency

Step-by-step explanation:

The equation needed:

  • Efficiency = Energy Output/Energy Input | (Eo)/(Ei)
  1. 75N = Output | 80N = Input
  2. (75)/(80) = 0.9375
  3. Simplify = 0.94
  4. Convert to Percentage 0.94 = 94% (Move two decimals to the right)

User Sloriot
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