Physics · Oct / Nov 2022 · Paper 41 · Question 4
0625
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The question as text
A quantity of gas is trapped by a piston in a cylinder with thin metal walls. The piston is free to move without friction within the cylinder. Fig. 4.1 shows the cylinder and piston. piston gas cylinder Fig. 4.1 The cylinder is placed inside a freezer.
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4(a)(i)[2]
240 N
F = pA in any form or 1.0 × 105 × 2.4 × 10–3
4(a)(ii)[2]
5.0 J
WD = Fx‖ or 240 × 0.021
4(b)[2]
(–)3.5 × 103 J
E = CDT in any form or 89 × (21 – (–18) or 89 × (3) or 89 × 39
4(c)[3]
(as the volume decreases) the particles collide more often
(as the temperature decreases) the particles collide less violently
two effects cancel (to leave the pressure unchanged) or particles collide with walls / piston / cylinder
4(d)[2]
(attractive) forces between (any two) particles large(r than in gases)
particles close(r) together (than gas particles) or particles already touching
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