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swimlife97

  • 2 years 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
    • 2 years 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
    • 2 years ago
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    Hint:\[P=\frac{W}{t}\]

  3. theEric
    • 2 years ago
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    Want another hint?

  4. swimlife97
    • 2 years ago
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    yes please

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

  6. swimlife97
    • 2 years ago
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    Is it force?

  7. theEric
    • 2 years ago
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    Why do you guess "force"?

  8. swimlife97
    • 2 years 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
    • 2 years 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
    • 2 years 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
    • 2 years ago
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    Okay thank you :)

  12. theEric
    • 2 years ago
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    You're welcome! :)

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

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