Book M Ch 4 Formula Quiz

7 Questions | Total Attempts: 171
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Book M Quizzes & Trivia

This is a pop quiz over the formulas we've been using in this chapter. All answers will be in the nearest WHOLE number , not tenths. Put ONLY the numbers in, not the units (such as Joules or Watts).

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Questions and Answers
  • 1. 
    How much power is needed to cut a lawn in 50 minutes if the work involved is 100,000J? Hint: you must convert minutes to seconds. 50 minutes times 60 seconds ? ___Watts (put only the numeric value to the nearest WHOLE number).   
  • 2. 
    As you push a lawn mover, the horizontal force is 300 N. If you push the mower a distance of 500 M, how much work do you do?  _____ J
  • 3. 
    A librarian lifts a box of books that weighs 93 N a distance of 1.5 m. How much work does she do? ____J
  • 4. 
    A teacher does 140 J of work in 20 s. How much power did he use?  ____W
  • 5. 
    You do 100 J of work in pulling out a nail with a claw hammer. If the hammer does 70 J of work, what is the hammer's efficiency? ______%
  • 6. 
    Find the efficiency of a machine if the input work is 150 J and the output work is 90 J.  _____%
  • 7. 
    To lift a crate, a pulley system exerts a force of 2,750 N. Find the mechanical advantage of the pulley system if the input force is 250 N.  ____
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