Consider the implications of the energy balance for a closed system.

1. For an adiabatic system with negligible changes in potential and kinetic energy, positive work done by the system on the surroundings implies __ change in internal energy of the system.

a) a negative

b) no change

c) a positive

2. In the absence of any kinetic or potential energy changes and any work, a system composed of condensing steam requires that Q be __.

a) negative

b) zero

c) positive

3. If only changes in kinetic and potential energy are permitted, then a falling object under the influence of gravity must __.

a) slow down

b) travel at constant speed

c) speed up

4. A system with positive acceleration has a __ .

a) positive

b) negative

c) zero

5. If Q = -W then __.

a) the system is isolated

b) the internal energy is constant

c) the system is insulated

d) the total energy of the system is constant

6. For the system of an expanding cylinder/piston assembly and contents providing work to a generator, is __.

a) negative

b) positive

c) zero

AU + AEk + AEp = Q + W =