A lightbulb has a power of 100 W. and is used for 4 hours. A microwave has a power of 1200 W and is used for 5 minutes.
a. How much energy is used by the lightbulb?
b. How much energy is used by the microwave?
c. The lightbulb has an efficiency of 1.8%. How much heat energy does the lightbulb produce in 4 hours?
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