The dot in Fig. 19-17 c represents the initial state of a gas, and the adiabat through the dot divides the p-V diagram into regions 1, and 2. For the following processes, determine whether the corresponding heat O is positive, negative, or zero: (a) the gas moves up along the adiabat, (b) it moves down along the adiabat, (c) it moves to anywhere in region 1, and (d) it moves to anywhere in region2.
Fig. 19-17
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