Question

за 3 часа пробега автомобиль, КПД двигателя которого равен 25 %, израсходовал 35л бензина. Какую среднюю мощность разлива двигатель автомобиля при этом пробеге?​

Answer 1

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Answer 2

Calculation of Average Power

To calculate the average power of the car engine during the given 3-hour journey, we need to know the amount of work done by the engine and the time taken. The work done by the engine can be calculated using the formula:

Work = Force x Distance

In this case, the force is the power generated by the engine, and the distance is the total distance traveled by the car. The power generated by the engine can be calculated using the formula:

Power = Work / Time

Given that the efficiency (KPD) of the engine is 25% and the car consumed 35 liters of gasoline, we can calculate the work done by the engine.

Calculation of Work Done

The work done by the engine can be calculated using the energy content of the gasoline consumed. Gasoline has an energy content of approximately 34.2 megajoules per liter (MJ/L) Therefore, the total energy consumed by the car can be calculated as:

Energy Consumed = Volume of Gasoline x Energy Content of Gasoline

Converting the volume of gasoline from liters to cubic meters:

Volume of Gasoline = 35 liters = 0.035 cubic meters

Substituting the values into the equation:

Energy Consumed = 0.035 cubic meters x 34.2 MJ/L

Calculation of Power

Now that we have the energy consumed by the engine, we can calculate the power generated by the engine using the formula:

Power = Energy Consumed / Time

Given that the journey lasted for 3 hours, we can substitute the values into the equation:

Power = (0.035 cubic meters x 34.2 MJ/L) / 3 hours

Calculating the average power:

Power = 0.0127 MJ/hour

Therefore, the average power of the car engine during the 3-hour journey is approximately 0.0127 megajoules per hour.

Please note that the calculation assumes a constant power output by the engine throughout the journey and does not take into account factors such as variations in speed or terrain.