Answer
(a) $2.3\times 10^6J$
(b) $2$
Work Step by Step
(a) We can find the required energy as
$P=\frac{W}{t}$
This can be rearranged as:
$W=Pt$
We plug in the known values to obtain:
$W=(0.30hp\times 746W/hp)(2h\times 3600s/h+49min\times 60s/min)$
$W=2.3\times 10^6J$
(b) We can find the required number of snickers candy bars as follows:
$2.3\times 10^6\times \frac{1Cal}{4186J}\times \frac{1\space snickers \space candy\space bars}{280cal}=1.9$
That is, 2 snickers candy bars.
