Question

Тепловая машина совершает за цикл работу 80 Дж. Определите количество теплоты, которое получает машина от нагревателя за цикл, если её КПД 40 %.

Answer 1

Calculation of the Heat Received by the Machine

To determine the amount of heat received by the machine from the heater during the cycle, we need to use the formula for thermal efficiency. The thermal efficiency (η) is defined as the ratio of the work output (W) to the heat input (Qh):

η = W / Qh

Given that the work done by the machine during the cycle is 80 J and the thermal efficiency is 40%, we can rearrange the formula to solve for Qh:

Qh = W / η

Substituting the given values:

Qh = 80 J / 0.4

Calculating the value:

Qh = 200 J

Therefore, the amount of heat received by the machine from the heater during the cycle is 200 J.