A 100-watt light bulb consumes 100 joules of energy every second. How long could you burn that light bulb from the energy in one penny, which has a mass of 0.003 kg? (Assume all the penny’s mass is converted to energy.)
Duration that the light bulb will burn from the energy in penny.
Answer to Problem 45A
The light bulb can burn for
Explanation of Solution
Given:
Mass of one penny is,
Power of bulb,
Formula Used:
From Einstein energy mass relation, the energy is given as
Where,
Calculation:
As, velocity of light is
So, from energy-mass relation the energy in penny is
Now, energy consumed by bulb is 100 J per second.
So, duration for which light bulb burn is
Conclusion:
Therefore, the light bulb can burn for
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