Problem data: m (the mass of the taken brass weight) = 200 g (0.2 kg); t0 (initial temperature of the brass weight) = 20 ºС; t (final temperature) = 28 ºС.
Reference values: Cl (specific heat of brass) = 400 J / (kg * K).
The amount of heat expended for heating the taken brass weight is determined by the formula: Q = Сl * m * (t – t0).
Calculation: Q = 400 * 0.2 * (28 – 20) = 400 * 0.2 * 8 = 640 J.
Answer: To heat the taken brass weight, 640 J of heat must be expended.
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