Question

Потужність автомобіля — 75 к. с. (1 к. с. = 0,735 кВт). Яку роботу може виконати цей двигун за 1 хв, якщо використовується лише 0,8 його повної потужності? ПОМОГИТЕ ПОЖАЛУЙСТА УМНЫЕ ЛЮДИ

Answer 1

Ответ:

2646 кДж

Объяснение:

N=55125 Вт     t=60 c     n=0.8   (80%)    A=?

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КПД   n=Ап/Аз=A/(N*t)

A=n*N*t=0.8*55125*60=2645000 Дж

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Answer 2

Calculation of Work Done by the Engine

To calculate the work done by the engine, we need to use the formula:

Work = Power x Time

Given that the power of the engine is 75 horsepower (1 horsepower = 0.735 kW), we can convert it to kilowatts:

Power = 75 horsepower x 0.735 kW/horsepower = 55.125 kW

Now, let's calculate the work done by the engine in 1 minute (60 seconds) when it is operating at 0.8 of its full power:

Power (at 0.8) = 0.8 x 55.125 kW = 44.1 kW

Time = 1 minute = 60 seconds

Using the formula, we can calculate the work done:

Work = Power x Time = 44.1 kW x 60 seconds = 2646 kJ

Therefore, the engine can perform 2646 kilojoules of work in 1 minute when operating at 0.8 of its full power.

Please note that the above calculation assumes that the engine operates at a constant power output throughout the entire minute. In reality, the power output of an engine can vary depending on various factors such as load and RPM.