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 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?
 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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Shane_B
 one year ago
Best ResponseYou've already chosen the best response.1Let me restate that...calculate the PE :)

applesjgtl
 one year ago
Best ResponseYou've already chosen the best response.0Oh, okay. \[PE=mg \Delta y\]?

Shane_B
 one year ago
Best ResponseYou've already chosen the best response.1Yes \[\Delta PE = mg\Delta h\]

applesjgtl
 one year ago
Best ResponseYou've already chosen the best response.0Okay: \[(750g)(9.81m/s^2)(15m)=110,362.5J\]

Shane_B
 one year ago
Best ResponseYou've already chosen the best response.1Almost...your mass needs to be in kg. Anyway, you'll get 110.3625J

applesjgtl
 one year ago
Best ResponseYou've already chosen the best response.0So the mass would be 7.5 kg?

Shane_B
 one year ago
Best ResponseYou've already chosen the best response.1\[Watts=\frac{Joules}{second}\]

applesjgtl
 one year ago
Best ResponseYou've already chosen the best response.0and that would be equal to 330W

Shane_B
 one year ago
Best ResponseYou've already chosen the best response.1To be more clear:\[330W=\frac{330Joules}{second}\]

applesjgtl
 one year ago
Best ResponseYou've already chosen the best response.0Hm. That can't be right, can it? Perhaps: \[330W=110.3625J/time (s)\]

Shane_B
 one year ago
Best ResponseYou've already chosen the best response.1That's not what I'm saying :) I just showed the conversion of 330W to Joules/second

applesjgtl
 one year ago
Best ResponseYou've already chosen the best response.0Oh right, I guess I knew that.

Shane_B
 one year ago
Best ResponseYou've already chosen the best response.1So if you have 330J/s of power available and need to perform 110.3625J of work, how long would that take?

applesjgtl
 one year ago
Best ResponseYou've already chosen the best response.0That seems really long.

Shane_B
 one year ago
Best ResponseYou've already chosen the best response.1It is. So your intuition is correct...that's not the answer

Shane_B
 one year ago
Best ResponseYou've already chosen the best response.1\[\frac{110.3625J}{330J/s}=?\]

Shane_B
 one year ago
Best ResponseYou've already chosen the best response.1It will take about 1/3 of a second :)

applesjgtl
 one year ago
Best ResponseYou've already chosen the best response.0I got .3344 seconds. Don't know how I got so confused the first time around. Thanks for your help, Shane!

Shane_B
 one year ago
Best ResponseYou've already chosen the best response.1no problem. I get confused sometimes too...it's physics after all!
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