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In a motorcycle engine, after combustion occurs in the top of the cylinder, the piston is forced down as the mixture of gaseous products undergoes an adiabatic expansion. Find the average power involved in this expansion when the engine is running at 4000 rpm, assuming that the gauge pressure immediately after combustion is 1.50 atm, the initial volume is 50.0 cm 3 , and the volume of the mixture at the bottom of the stroke is 250 cm 3 . In the solution of this question at http://www.askiitians.com/iit-jee-thermal-physics/thermodynamic-process-and-their-types/#solved-problems why do we take initial pressure of the system as 16.0 atm? It is not given in the question.

In a motorcycle engine, after combustion occurs in the top of the cylinder, the piston is forced down as the mixture of gaseous products undergoes an adiabatic expansion. Find the average power involved in this expansion when the engine is running at 4000 rpm, assuming that the gauge pressure immediately after combustion is 1.50 atm, the initial volume is 50.0 cm3, and the volume of the mixture at the bottom of the stroke is 250 cm3.
 
 
In the solution of this question at http://www.askiitians.com/iit-jee-thermal-physics/thermodynamic-process-and-their-types/#solved-problems 
 
why do we take initial pressure of the system as 16.0 atm? It is not given in the question.

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