With the PASCO engine apparatus and the external volume connected to it, it is p

Question

With the PASCO engine apparatus and the external volume connected to it, it is possible to trap n moles of an ideal gas (air) inside the cylinder of the engine plus the external volume. One can then change P, V and T while keeping n constant. Imagine one then has the n moles of gas goes through the path A to B to C to D and back to A (called a cycle), as is shown in the P vs. V diagram at right. You will see in the lectures that all our engines (cars, trucks, motorcycles, etc.) run through cycles which repeat themselves over and over. Energy is given to the engine in the form of heat, and mechanical work is obtained form the engine. Respond to the following questions by selecting one of the following next to each possible variable: Decreases, Stays the same, or Increases. The gas is made to go from state A to state B, we can say that: The gas is made to go from state B to state C we can say that: The gas is made to go from state C to state D, we can say that: The gas is made to go from state D to state A, we can say that:

Explanation / Answer

from A to B, P stays the same V decreases T decreases

from B to C, P decreases, V stays the same T decreases

from C to D, P stays the same, V increases, T increases

from D to A, P increases, V stays the same, T increases

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