The internal combustion engine consumes 30 kg gasoline in one hour. If the efficiency of the engine is 25%, the power of the engine can be calculated

The internal combustion engine consumes 30 kg gasoline in one hour. If the efficiency of the engine is 25%, the power of the engine can be calculated

You need to know the heat of gasoline

The useful power of internal combustion engine is only more than 40%. Who can explain the internal consumption in detail?
That is to say, more than half of the power is useless. It is consumed from the internal combustion engine itself

Insufficient combustion, heat loss from exhaust gas and heat absorption by cylinder

How to calculate the compression ratio of internal combustion engine?

The ratio of the volume before compression to the volume after compression is called compression ratio

The weight of a car is 2 tons. When the car moves forward at a constant speed on a horizontal road, the resistance it receives is 0.05 times of the weight of the car!
The weight of a car is 2 tons. The resistance received by the car is 0.05 times of the weight of the car when it moves forward at a constant speed on a horizontal road. The car moves forward for 1000 meters and lasts for 50 seconds. The power of the car when it moves (G is taken as 10N / kg) can be calculated
The format should be correct
There should be units

It is known that M = 2T = 2000kg, s = 1000m, t = 50s, f = 0.05g
When a car runs at a constant speed, its traction and resistance are equal
That is, f = f = 0.05g = 0.05mg = 0.05 * 2000kg * 10N / kg = 1000N
W=Fs=1000N*1000m=1000000J
P=W/t=1000000J/50s=20000W.