A diesel engine has an air temperature and pressure at the beginning of the compression stroke of 290K and 220 kPa, respectively (State 1). At the end of the heat addition process the temperature and pressure are 1550K and 7200 kPa, respectively. Compute the following: (a) the temperature at the end of the compression process, (b) the volumetric compression ratio, (c) the temperature at the end of the expansion process, (d) the cycle thermal efficiency, and (e) the mean effective pressure. Assume air to be an ideal gas with Cp, o=1.004 kJ/(kg K) and Cv, o=0.717 kJ/(kg K).

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.