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applesjgtl Group Title

A monkey uses a fishing pole to raise 750g of bananas up to his position 15m above the ground. If the monkey's power output was 330 W, how long did it take to reel in the bananas?

  • one year ago
  • one year ago

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  1. applesjgtl Group Title
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    W=f*d?

    • one year ago
  2. Shane_B Group Title
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    Let me restate that...calculate the PE :)

    • one year ago
  3. applesjgtl Group Title
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    Oh, okay. \[PE=mg \Delta y\]?

    • one year ago
  4. Shane_B Group Title
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    Yes \[\Delta PE = mg\Delta h\]

    • one year ago
  5. applesjgtl Group Title
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    Okay: \[(750g)(9.81m/s^2)(15m)=110,362.5J\]

    • one year ago
  6. Shane_B Group Title
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    Almost...your mass needs to be in kg. Anyway, you'll get 110.3625J

    • one year ago
  7. applesjgtl Group Title
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    So the mass would be 7.5 kg?

    • one year ago
  8. Shane_B Group Title
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    No :) 750g = 0.75kg

    • one year ago
  9. applesjgtl Group Title
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    Sorry, what is s?

    • one year ago
  10. Shane_B Group Title
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    seconds

    • one year ago
  11. Shane_B Group Title
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    \[Watts=\frac{Joules}{second}\]

    • one year ago
  12. applesjgtl Group Title
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    and that would be equal to 330W

    • one year ago
  13. Shane_B Group Title
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    To be more clear:\[330W=\frac{330Joules}{second}\]

    • one year ago
  14. applesjgtl Group Title
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    Hm. That can't be right, can it? Perhaps: \[330W=110.3625J/time (s)\]

    • one year ago
  15. Shane_B Group Title
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    That's not what I'm saying :) I just showed the conversion of 330W to Joules/second

    • one year ago
  16. applesjgtl Group Title
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    Oh right, I guess I knew that.

    • one year ago
  17. Shane_B Group Title
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    So if you have 330J/s of power available and need to perform 110.3625J of work, how long would that take?

    • one year ago
  18. applesjgtl Group Title
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    36419.63 seconds?

    • one year ago
  19. applesjgtl Group Title
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    That seems really long.

    • one year ago
  20. applesjgtl Group Title
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    Also seems wrong.

    • one year ago
  21. Shane_B Group Title
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    It is. So your intuition is correct...that's not the answer

    • one year ago
  22. Shane_B Group Title
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    \[\frac{110.3625J}{330J/s}=?\]

    • one year ago
  23. Shane_B Group Title
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    It will take about 1/3 of a second :)

    • one year ago
  24. applesjgtl Group Title
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    I got .3344 seconds. Don't know how I got so confused the first time around. Thanks for your help, Shane!

    • one year ago
  25. Shane_B Group Title
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    no problem. I get confused sometimes too...it's physics after all!

    • one year ago
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