To what temperature a piece of copper with a mass of 400 g will be heated if we give it 16.8 J of energy at 18 temperatures.

Problem data: m (mass of the heated piece of copper) = 400 g (in SI m = 0.4 kg); Q (heat energy reported to copper) = 16.8 J; t0 (initial temperature of a piece of copper) = 18 ºС.
Reference values: Cm (specific heat of copper) = 400 J / (kg * K).
The temperature that a piece of copper will acquire as a result of heating is determined using the formula: Q = Cm * m * (t – t0) whence t = Q / (Cm * m) + t0.
Let’s make a calculation: t = 16.8 / (400 * 0.4) + 18 = 18.105 ºС.
Answer: A piece of copper can heat up to 18.105 ºС.