anonymous
  • anonymous
If you are given time and distance, you can determine power if you know force. watts. energy. joules.
Physics
jamiebookeater
  • jamiebookeater
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theEric
  • theEric
Well, watts are the units of power, and joules are the units of energy, and this question isn't going for you knowing units. It wants you to know which physical concept is missing from knowing the power. You're down to "force" or "energy." Do you have a guess and a reason?
theEric
  • theEric
Hint:\[P=\frac{W}{t}\]
theEric
  • theEric
Want another hint?

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anonymous
  • anonymous
yes please
theEric
  • theEric
Okay!\[W=F\ d\ cos(\theta)\]Put that in the power equation, if you need another hint.
anonymous
  • anonymous
Is it force?
theEric
  • theEric
Why do you guess "force"?
anonymous
  • anonymous
W=F d cos(θ) W is work in Joules; F is force through distance; Cos theta is cosine of an angle theta
theEric
  • theEric
So, you say the answer is force because, well, you need it. And I agree, you're totally right.
theEric
  • theEric
\[P=\frac{W}{t}=\frac{F\ d\ cos(\theta)}{t}\]so you know distance and time, you just need force. The equations can be telling!
anonymous
  • anonymous
Okay thank you :)
theEric
  • theEric
You're welcome! :)
theEric
  • theEric
And congrats, because you did it! I just posted equations, haha.

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