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A warm cup of coffee has 20 000 J of energy.

After being heated in a microwave, the cup of

coffee has 70 000 J of energy. How much work

was done by the microwave to heat the coffee?

(a) 20 000 J

(b) 50 000 J

(c) 70 000 J

(d) 90 000 J

Answer :

LYDIACAVE046GO

Answer:

(b) 50,000 J

Explanation:

it starts with 20,000 and ends with 70,000 so the difference is 50,000

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