Question

how much time is needed to produce 720 joules of work if 90 watts of power is used? 80 s 8 s 64800 s 0.125 s

Explanation:

Step1: Recall power - work - time formula

Power $P=\frac{W}{t}$, where $P$ is power, $W$ is work, and $t$ is time. We need to solve for $t$. Rearranging the formula gives $t = \frac{W}{P}$.

Step2: Substitute given values

We know that $W = 720\ J$ and $P=90\ W$. Substituting into $t=\frac{W}{P}$, we get $t=\frac{720}{90}$.

Step3: Calculate the result

$\frac{720}{90}=8\ s$.

Answer:

8 s