Question

Автомобиль движется со скоростью 54 кмч и расходует 4,3 кг бензина на пути 60 км. КПД двигателя — 18 %. Определи мощность, развиваемую двигателем автомобиля. (Удельная теплота сгорания бензина равна 45МДжкг).​

Answer 1

Q = q*m = 45*10^6*4,3=193,5*10^6

Qпол = q*m*КПД = 193,5*10^6*0,24 = 46,44*10^6

N = Qпол/t = Qgпол*v/S = 46,44*10^6*15K/60*10^3 = 696,6*10^6/60*10^3

= 11,61 K

Объяснение:

Для примера как должно быть:

Answer 2

Calculation of Power

To determine the power developed by the car's engine, we can use the formula:

Power = Work / Time

The work done by the engine can be calculated using the formula:

Work = Force × Distance

The force can be calculated using the formula:

Force = Mass × Acceleration

Since the car is moving at a constant speed, the acceleration is zero. Therefore, the force acting on the car is also zero. Hence, the work done by the engine is zero.

Now, let's calculate the power developed by the engine using the given information.

Given: - Speed of the car = 54 km/h - Distance traveled = 60 km - Fuel consumption = 4.3 kg - Efficiency of the engine = 18% - Specific heat of combustion of gasoline = 45 MJ/kg

First, let's convert the speed from km/h to m/s:

Speed = 54 km/h = (54 × 1000) / 3600 m/s = 15 m/s

Next, let's calculate the time taken to travel the given distance:

Time = Distance / Speed = 60 km / 15 m/s = 4 s

Now, let's calculate the energy consumed by the engine:

Energy = Fuel consumption × Specific heat of combustion of gasoline = 4.3 kg × 45 MJ/kg = 193.5 MJ

Since the efficiency of the engine is given as 18%, we can calculate the useful energy output:

Useful energy output = Efficiency × Energy = 0.18 × 193.5 MJ = 34.83 MJ

Finally, let's calculate the power developed by the engine:

Power = Useful energy output / Time = 34.83 MJ / 4 s = 8.71 MW

Therefore, the power developed by the engine of the car is approximately 8.71 MW.