Question

При сгорании топлива в тепловом двигателе за 30 мин выделилась энергия 10,8 МДж. Определите мощность двигателя,если его КПД 20%

Answer 1

КПД = A*100%/Q

A= 0,2*10,8=2,16 МДж

P=A/t=2160 000 Дж/1800 с=1200 Вт - ответ

Answer 2

Calculation of Engine Power

To determine the power of the engine, we can use the formula:

Power (P) = Energy (E) / Time (t)

Given that the energy released during the combustion of fuel in the thermal engine is 10.8 MJ and the time taken is 30 minutes, we need to convert the time to seconds:

Time (t) = 30 minutes * 60 seconds/minute = 1800 seconds

Now we can calculate the power of the engine:

Power (P) = 10.8 MJ / 1800 seconds = 6 kW

Therefore, the power of the engine is 6 kilowatts.