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anonymous

  • one year ago

Four weightlifters (A-D) enter a competition. The mass and distance that each lifts are shown in the table drawn inside. Which weightlifter does the least work? weighlifter A, weightlifter B, weightlifter C, or Weightlifter D?

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  1. anonymous
    • one year ago
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    |dw:1433095867077:dw|

  2. anonymous
    • one year ago
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    W = weightlifter D =distance :)

  3. Michele_Laino
    • one year ago
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    the work W done, is given by the subsequent formula: \[W = mgd\]

  4. anonymous
    • one year ago
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    yes:) so the one with the least work is the smallest value of that? how can we find that?

  5. Michele_Laino
    • one year ago
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    it is simple we have to compute the work W for all of your four cases

  6. anonymous
    • one year ago
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    ok! how do we plug in? :/

  7. Michele_Laino
    • one year ago
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    since the gravity g=9.81, is equal for all the weightlifter, it is suffice to compare the four products mass*distance each other

  8. anonymous
    • one year ago
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    ok! so weightlifter A = 225 B=264 C=300 D=312.5 so A is our solutoin? he does the least work?

  9. Michele_Laino
    • one year ago
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    so: case A--->M*D=225 case B--->M*D=264 case C---> M*D=300 case D--->M*D=312.5

  10. Michele_Laino
    • one year ago
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    that's right!

  11. anonymous
    • one year ago
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    yay!! thank you!! onto the next! :P

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