In a gasoline engine, fuel vapors are ignited by a spark. in a diesel engine, a fuel-air mixture is drawn in, then rapidly compressed to as little as 1/20 the original volume, in the process increasing the temperature enough to ignite the fuel-air mixture.

part a

explain why the temperature rises during the compression.

drag the terms on the left to the appropriate blanks on the right to complete the sentences.

increases

escapes

doesn't escape

decreases

the piston does work on the gas which the thermal energy; and it does so quickly enough that heat the system fast enough to keep the gas below ignition temperature.

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.