A steel drill with a mass of 200 g when the engine is running heats up from 15 degrees to 115 degrees how much energy is spent how much energy is spent to heat the drill.
To solve the presented problem, we write down the formula for finding the amount of heat for a steel drill, it is equal to the expended energy:
E = Q = cm (t – t0),
where Q is the amount of heat,
с – specific heat capacity of steel,
t is the final temperature of the drill,
t0 is the starting temperature of the drill.
The specific heat capacity of steel is 460 J / kg * 0С.
Let’s convert the mass to kilograms:
200 g = 0.2 kg.
Substitute all known quantities into the formula for the amount of heat:
E = 460 * 0.2 * (115 – 15) = 460 * 0.2 * 100 = 460 * 20 = 9 200 J.
Answer: 9 200 J.
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