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Объяснение:
Задача 1.
При нагревании, поскольку изменение внутренней энергии тела прямо пропорционально изменению температуры тела.
[1]
Задача 2.
Дано:
Q₁ = 300 Дж
A = 36 Дж
ΔU - ?
Первое начало термодинамики:
Q = ΔU + A
ΔU = Q - A = 300 - 36 = 264 Дж
Задача 3
Дано:
Q = 300 Дж
A' = 500 Дж
ΔU - ?
Первое начало термодинамики:
Q = ΔU - A'
ΔU = Q + A' = 300 + 500 = 800 Дж
Задача 4.
"Если в некоторый момент времени замкнутая система находится в неравновесном макроскопическом состоянии, то в последующие моменты времени наиболее вероятным следствием будет монотонное возрастание её энтропии".
Это закон неубывания энтропии, или так называемый физический смысл второго закона термодинамики.
Задача 5.
Дано:
T₁ = 3073 К
T₂ = 273 K
КПД - ?
КПД = 1 - Т₂ / T₁
КПД = 1 - 273 / 3073 ≈ 0,91 или 91%