A gas is confined in a cylinder that is 5 cm in diameter with a movable piston at the top, as in Figure 1-20. The piston itself weighs 0.1 kilograms. If the gas is heated and expands, what is the force opposing the expansion? Assume friction is negligible

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Initial State Patm = 101.3 kPa Patm M = 0.1 kg Pgas Final State Patm = 101.3 kPa atm M = 0.1 kg Pgas 5 cm- FIGURE 1-20 Expansion of a gas in a piston-cylinder device. -5 cm-