Lesson: Chapter 9 — Heat

Calculating a quantity of heat 3 of 5 Reset answers

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Question 3

2 kg of copper at 30 °C takes in 20 000 J (c = 400 J kg^-1 K^-1). What is its final temperature?

A 50 °C B 55 °C C 25 °C D 80 °C

The right answer is the one marked above.

55 °C. θ = 20 000 ÷ 800 = 25 °C, and that rise is added to the starting 30 °C.

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