Question #3d83f

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Answer 1 · 2016-11-12T09:00:11

10.25 W

In vector notation, work done is defined as:

$W = \to F . \to S$ $W=vecF.vecS$

So by definition power is:

$P = \frac{\to F . \to S}{t}$ $P=(vecF.vecS)/t$

we are given $\to F$ $vecF$ and $\to S$ $vecS$ . The dot product is:

$= (4 \cdot 3) + (7 \cdot 2) + (- 3 \cdot - 5) = 12 + 14 + 15 = 41 J$ $=(4*3)+(7*2)+(-3*-5)=12+14+15=41 J$

So $p o w e r = \frac{41}{4} = 10.25 W$ $power = 41/4=10.25 W$