phys: power equation use magnitude of force
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@ -476,7 +476,7 @@ Power is a a scalar unit represented in **watts** ($\text{1 W}=\frac{\text{1 J}}
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$$P=\frac{\Delta E}{\Delta t}$$
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Also:
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$$P=\vec{F}v$$
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$$P=|\vec{F}|v$$
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### Efficiency
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