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Author Question: A block and tackle has a 7:1 mechanical advantage. To lift a load of 600 lbs one foot, an effort ... (Read 25 times)

cherise1989

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on: Aug 19, 2018
A block and tackle has a 7:1 mechanical advantage. To lift a load of 600 lbs one foot,
  an effort force of 104 lbs must be applieD. What is the percent efficiency?
 
  A. 17
  B. 82
  C. 96
  D. 100

Question 2

A first-class lever is used to lift 300 lbs - output lever arm is 3 foot long; the input force is 50 lbs. What is the input lever length?
 
  A. 0.5 feet
  B. 6.0 feet
  C. 18 feet
  D. 100 feet


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Jayson

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Reply #1 on: Aug 19, 2018
Answer to Question 1

B

Answer to Question 2

C


cherise1989

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Reply #2 on: Aug 19, 2018
TY


Jayson

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Reply #3 on: Aug 19, 2018
You're welcome


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