When the sum of all the forces acting on a block on an inclined plane is zero, the block A) must be at rest
B) must be accelerating
C) may be slowing down
D) may be moving at constant speed

What accounts for an increase in the temperature of a gas that is kept at constant volume? a. energy has been removed as heat from the gas. b. energy has been added as heat to the gas. c. energy has been removed as work done by the gas. d. energy has been added as work done by the gas.