How much heat is required to heat two cubic centimeters of copper from 21 ° C to 25 ° C.

Given:

V = 2 cm ^ 3 – the volume of copper;

T1 = 21 degrees Celsius – initial copper temperature;

T2 = 25 degrees Celsius – final temperature of copper;

ro = 8.92 grams / cm ^ 3 – copper density;

c = 385 J / (kg * C) – specific heat of copper.

It is required to determine how much energy Q (Joule) is required to heat copper from T1 to T2.

Find the mass of copper:

m = ro * V = 8.92 * 2 = 17.84 grams = 1.8 * 10 ^ -2 kilograms.

Then the amount of required energy will be equal to:

Q = c * m * (T2 – T1) = 385 * 1.8 * 10 ^ -2 * (25 – 21) = 693 * 10 ^ -2 * 4 = 27.7 Joules.

Answer: to heat copper, you need to expend energy equal to 27.7 Joules.