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anonymous

  • one year ago

four machines (A-D) push four identical heavy boxes 100 m along a track. According to the graph, which machine pushed with the greatest force? Machine A, machine B, machine C, machine D, or all pushed with the same force?

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  1. anonymous
    • one year ago
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    |dw:1434871090192:dw|

  2. Michele_Laino
    • one year ago
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    we have this general relationship, between power P, force F and velocity v: \[\Large P = {\mathbf{F}} \cdot {\mathbf{v}}\]

  3. anonymous
    • one year ago
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    ok!

  4. Michele_Laino
    • one year ago
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    that is a vector equation. Now if velocity and Force have the same orientation and direction, we can write: \[\Large P = Fv\]

  5. anonymous
    • one year ago
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    yes!

  6. Michele_Laino
    • one year ago
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    that equation, in the plane P-v represents a line whose slope is the force F

  7. anonymous
    • one year ago
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    so mahcine A is the solution here?

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

  9. anonymous
    • one year ago
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    yay~ thanks!!

  10. Michele_Laino
    • one year ago
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    :)

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