Thermodynamics Chapter 2 True/False

Power is related mathematically to the amount of energy transfer by work by integrating over time

False, Rate of energy transfer by work by derivative of time, NOT integrating over time.

If a system's temperature increases, it must have experienced heat transfer.

False, The temperature of a system may increase due to work transfer also

The total energy of a closed system can change as a result of energy transfer across the system boundary by heat and work and energy transfer accompanying mass flow across the boundary

False, a closed system always contains the same mass; only energy can be transferred across the boundary

Heat is a property

False, heat is not a property.

If a closed system undergoes a process for which the change in total energy is positive, the heat transfer must be positive

False; a situation may occur in which the heat transfer from the system (-Q) is less than the work done on the system (-W) resulting in a positive change in total energy

If a closed system undergoes a thermodynamic cycle, there can be no net work or heat transfer

False; there can be heat transfer; there cannot be mass transfer in a closed system

The energy of an isolated system can only increase

False; there is not energy transfer in an isolated system, therefore no increase in energy could occur

A spring is compressed adiabatically and its internal energy increases

True

For a system at steady state, no property values change with time

True

If a closed system undergoes a process for which the work is negative and the heat transfer is positive, the total energy of the system must increase

True

In Closed systems, energy can only be transferred in and out across the system boundary by two means: work and heat

True

In principle, expansion or compression work can be evaluated using ∫ p dV for both actual and quasi-equilibrium expansion processes.

True

Only changes in the internal energy of a system between two states have significance; no significance can be attached to the internal energy at a state.

True

When you divide an extensive property by an extensive property you get an intensive property

True

Work is not a property

True