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## Q. 1.1

Electric power and energy are often underestimated. Consider an 80W
bulb, which is on for 24 hours. Using the energy spent by the bulb, how many meters
can a 1000 kg object be lifted?

## Verified Solution

The energy spent by the bulb is

$w_{b} =24\times 60\times 80=6.912\times 10^{6} J$ .

Then, assuming $g=10m/s^{2}$ and using   $w_{p}=mgh$  for the potential energy,

we have  $1000\times 10\times h=60912\times 10^{6} \longrightarrow h=691.2m$