Determine the mass of a silver spoon if 250 Joules of energy is required to change

Determine the mass of a silver spoon if 250 Joules of energy is required to change its temperature from 20 to 40 ° C.

Initial data: t0 (temperature of the silver spoon before heating) = 20 ° С; t (final temperature of the spoon heating) = 40 ° С; Q (required amount of energy) = 250 J.

Reference data: C (specific heat of silver) = 250 J / (kg * K).

The required mass of the silver spoon is determined from the formula: Q = C * m * (t – t0), whence m = Q / (C * (t- t0)).

Let’s calculate: m = 250 / (250 * (40 – 20)) = 1/20 = 0.05 kg = 50 g.

Answer: A silver spoon weighs 50 grams.