Question

Автомобиль движется со скоростью 54 кмч и расходует 5,1 кг бензина на пути 66 км. КПД двигателя — 29 %. Определи мощность, развиваемую двигателем автомобиля. (Удельная теплота сгорания бензина равна 45МДжкг). Ответ (округли до десятых): кВт.

Answer 1

Ответ:

15,1 кВт

Объяснение:

v=15 м/с    m=5.1 кг    n=0.29 (29%)   q=45*10⁶ Дж/кг    s=66*10³ м   P=?

===

n=P*t/Q

Q=q*m

t=s/v

P=n*q*m*v/s=0.29*45*10⁶*5.1*15/(66*10³)≈15.1*10³ Вт

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Answer 2

Ответ: 15кВт

Объяснение:

Дано:

V=54км/ч

S=66км

η=29%=0,29

q=45МДж

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N-?

Теплота от сгорания бензина равна:

Q=q*m=45*5,1=229,5МДж

Полезная работа равна:

A=Q*η=229,5*0,29=66,555МДж

Время, за которое сделана полезная работа, равно:

t=S/V=66/54=1,22ч=4392с

Мощность двигателя равна:

N=A/t=66,555/4392=0,015МВт=15кВт

Answer 3

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 x Distance

In this case, the force can be calculated using the formula:

Force = Mass x Acceleration

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

Since no work is done, the power developed by the engine is also zero.

Therefore, the power developed by the engine of the car is 0 kW.

Please note that the given information does not provide any data about the force or acceleration of the car. Without this information, we cannot calculate the power developed by the engine.

If you have any further questions, feel free to ask!