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swimlife97

If you are given time and distance, you can determine power if you know force. watts. energy. joules.

  • 9 months ago
  • 9 months ago

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  1. theEric
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    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?

    • 9 months ago
  2. theEric
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    Hint:\[P=\frac{W}{t}\]

    • 9 months ago
  3. theEric
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    Want another hint?

    • 9 months ago
  4. swimlife97
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    yes please

    • 9 months ago
  5. theEric
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    Okay!\[W=F\ d\ cos(\theta)\]Put that in the power equation, if you need another hint.

    • 9 months ago
  6. swimlife97
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    Is it force?

    • 9 months ago
  7. theEric
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    Why do you guess "force"?

    • 9 months ago
  8. swimlife97
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    W=F d cos(θ) W is work in Joules; F is force through distance; Cos theta is cosine of an angle theta

    • 9 months ago
  9. theEric
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    So, you say the answer is force because, well, you need it. And I agree, you're totally right.

    • 9 months ago
  10. theEric
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    \[P=\frac{W}{t}=\frac{F\ d\ cos(\theta)}{t}\]so you know distance and time, you just need force. The equations can be telling!

    • 9 months ago
  11. swimlife97
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    Okay thank you :)

    • 9 months ago
  12. theEric
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    You're welcome! :)

    • 9 months ago
  13. theEric
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    And congrats, because you did it! I just posted equations, haha.

    • 9 months ago
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