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Unformatted text preview: (d) Suppose the heaters have 25 W of power and are turned on for 15 s. What is the ﬁnal volume of container B? Problem 4 A monatomic gas follows the process 1-→ 2-→ 3 shown in the ﬁgure below. How much heat is needed for (a) process 1-→ 2 and (b) process 2-→ 3? 1 - 1 Problem 5 A 6 . 0-cm-diameter cylinder of nitrogen gas has a 4 . 0-cm-thick movable copper piston. The cylinder is oriented vertically, as shown in the ﬁgure below, and the air above the piston is evacuated. When the gas temperature is 20 ◦ C, the piston ﬂoats 20 cm above the bottom of the cylinder. (a) What is the gas pressure? (b) How many gas molecules are in the cylinder? Then 2 . 0 J of heat energy are transferred to the gas. (c) What is the new equilibrium temperature of the gas? (d) What is the ﬁnal height of the piston? (e) How much work is done on the gas as the piston rises? 1 - 2...
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