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applesjgtl

  • one year ago

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?

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  1. applesjgtl
    • one year ago
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    W=f*d?

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

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

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

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

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

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

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

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

  10. Shane_B
    • one year ago
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    seconds

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

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

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

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

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

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

  17. Shane_B
    • one year ago
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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?

  18. applesjgtl
    • one year ago
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    36419.63 seconds?

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

  20. applesjgtl
    • one year ago
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    Also seems wrong.

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

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

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

  24. applesjgtl
    • one year ago
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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!

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

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