Data: m (mass of heated zinc) = 5 t = 5 * 10 ^ 3 kg; tн (initial zinc temperature) = 20 ºС; tк (final temperature) = 400 ºС; SC (specific heat capacity of zinc) = 400 J / (kg * K).
Required heat: Q = Cц * m * (tк – tн) = 400 * 5 * 10 ^ 3 * (400 – 20) = 760 * 10 ^ 6 J.
Answer: To heat 5 tons of zinc, 760 MJ of heat is needed.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.