Question

How much energy is lost by 20 kg copper if it is cooled from 50℃ 30℃?

Answer 1

Answer:

HEAT ENERGY

Given

• Mass (m) = 20 kg

• Specific heat capacity of copper (c) = 0.385 J/g °C

• Change of Temperature (ΔT) = 50° C → 30°C

• Energy Lost (Q) = ?

Q = mcΔT

Q = (20 kg)(0.385 J/g °C)(30 - 50)

Q = (20 kg)(0.385 J/g °C)(-20)

Q = -154 J

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