An engine has an energy input of 125 j, and 35 j of that energy is transformed into useful energy. what is the efficiency of the engine?

Efficiency is equal to 35 / 125 * 100 which is equal to 28%.

Efficiency is the ratio of the useful work performed by a machine or in a process to the total energy that it consumed.

So basically it is the useful output which in this case was 35 J divided by the total input given to the machine which was 125 J in this case multiplying by 100 to get the percentage.

If we did not need the percentage then we could have simply not multiplied it by 100.

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graph slopes whilst gas cools, then it is flat whilst conensation to liquid happens, the coolong liquid then graphs as a slope when it solidifies graph is flat

latent heat