How much heat is required to heat a 200 g iron part at 50 C? How much heat is released during the combustion of 2.5 kg of gasoline?
m = 200 g = 0.2 kg.
Δt = 50 ° C.
C = 460 J / kg * ° C
The amount of heat Q, which is necessary for heating a substance, is determined by the formula: Q = C * m * Δt, where C is the specific heat capacity of the substance, m is the mass of the substance, Δt is the change in the temperature of the substance.
Q = 460 J / kg * ° C * 0.2 kg * 50 ° C = 4600 J.
Answer: to heat the part, you need Q = 4600 J of thermal energy.
m = 2.5 kg.
q = 4.6 * 10 ^ 7 J / kg.
The amount of heat Q, which is released during the combustion of fuel, is determined by the formula: Q = q * m, where q is the specific heat of combustion of the fuel, m is the mass of the substance that has burned.
Q = 4.6 * 10 ^ 7 J / kg * 2.5 kg = 11.5 * 10 ^ 7 J.
Answer: during the combustion of gasoline, Q = 11.5 * 10 ^ 7 J of thermal energy was released.
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