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Chapter 1

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?

Step-by-Step

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