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

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

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

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

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

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

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

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

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

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

Shane_B
 2 years 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
 2 years ago
Best ResponseYou've already chosen the best response.0That seems really long.

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

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

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

applesjgtl
 2 years 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
 2 years 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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