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swimlife97

  • one year ago

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

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  1. theEric
    • one year ago
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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?

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

  3. theEric
    • one year ago
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    Want another hint?

  4. swimlife97
    • one year ago
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    yes please

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

  6. swimlife97
    • one year ago
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    Is it force?

  7. theEric
    • one year ago
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    Why do you guess "force"?

  8. swimlife97
    • one year ago
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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. theEric
    • one year ago
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    So, you say the answer is force because, well, you need it. And I agree, you're totally right.

  10. theEric
    • one year ago
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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!

  11. swimlife97
    • one year ago
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    Okay thank you :)

  12. theEric
    • one year ago
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    You're welcome! :)

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

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