While rowing across the lake during a race, John does 3,960 J of work on the oars in 60.0 s. What is his power output in watts?

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Answer 1 · 2018-04-13T13:10:09

$66 W$ $66 W$

Formula of Power:

$\frac{W o r k}{t i m e t a k e n}$ $color(blue)((Wo rk)/(time taken))$

Given: Work = $3960 J$ $3960 J$ and time taken = $60.0 s$ $60.0s$

Using the formula:

$\frac{W o r k}{t i m e t a k e n}$ $color(blue)((Wo rk)/(time taken))$

= $\frac{3960 J}{60.0 s}$ $(3960 J)/(60.0 s)$

= $66 W$ $66 W$

Answer 2 · 2018-04-13T13:41:31

$66$ $66$ watts

Power is calculated through the equation,

$P = \frac{W}{t}$ $P=W/t$

$W$ $W$ is the work done in joules

$t$ $t$ is the time in seconds

So, we got:

$P=(3960 \ "J")/(60 \ "s")$

$=66 \ "W"$