Which statement best describes the adiabatic process? a. in an adiabatic process, no heat enters or leaves the system. b. in an adiabatic process, the system does no work nor is work done on it. c. in an adiabatic process, the temperature of the system remains constant. d. in an adiabatic process, the pressure of the system remains constant.

In any adiabatic system we always say that exchange of heat in that system must be zero

so from first law we have

so we have

so here we can say that negative change in internal energy is equal to work done by the system.

so the correct answer must be

A. In an adiabatic process, no heat enters or leaves the system.

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.