Fig. 5.1 shows a gas contained in a cylinder enclosed by a piston. piston -pressure gauge -cylinder gas 100 cm Fig. 5.1 At first, the length of cylinder containing the gas is 100 cm. The pressure of the gas, shown by the pressure gauge, is 300 kPa. The area of cross-section of the cylinder is 0.12 m. (a) O Describe the motion of the molecules of the gas. (ii) Use the idea of momentum to explain how the molecules exert a force on the walls of the cylinder.

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5
Fig. 5.1 shows a gas contained in a cylinder enclosed by a piston.
piston
-pressure gauge
-cylinder
gas
100 cm
Fig. 5.1
At first, the length of cylinder containing the gas is 100 cm. The pressure of the gas, shown by the
pressure gauge, is 300 kPa. The area of cross-section of the cylinder is 0.12 m.
(a) () Describe the motion of the molecules of the gas.
(ii) Use the idea of momentum to explain how the molecules exert a force on the walls of the
cylinder.
Transcribed Image Text:5 Fig. 5.1 shows a gas contained in a cylinder enclosed by a piston. piston -pressure gauge -cylinder gas 100 cm Fig. 5.1 At first, the length of cylinder containing the gas is 100 cm. The pressure of the gas, shown by the pressure gauge, is 300 kPa. The area of cross-section of the cylinder is 0.12 m. (a) () Describe the motion of the molecules of the gas. (ii) Use the idea of momentum to explain how the molecules exert a force on the walls of the cylinder.
(b) The piston is moved so that the new length of cylinder occupied by the gas is 40cm. The
temperature of the gas is unchanged.
() Calculate the new pressure of the gas.
pressure =
(ii) Explain, in terms of the bebaviout of the molecules, why the pressure has changed.
Transcribed Image Text:(b) The piston is moved so that the new length of cylinder occupied by the gas is 40cm. The temperature of the gas is unchanged. () Calculate the new pressure of the gas. pressure = (ii) Explain, in terms of the bebaviout of the molecules, why the pressure has changed.
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