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Question 2 Coal has about 30E6 J of energy per kg, but a power plant can only use 30% of this energy to make electricity

Question 2 Coal has about 30E6 J of energy per kg, but a power plant can only use 30% of this energy to make electricity (i.e., it is 30% efficient). How many kilograms of coal have to be burned to light a 100 W light bulb for one day?

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