2.1. Kinetic particle model of matter
A subsection of Physics, 5054, through 2. Thermal physics
Listing 10 of 86 questions
A car has a gas-filled shock absorber for each of its four wheels. shows one of these shock absorbers. attached to car body trapped gas piston cylinder axle The axles are attached to the cylinders. The body of the car is supported by the four pistons, which can move up and down inside the cylinders. Each piston has a cross-sectional area of 35 cm2. A driver of mass 70 kg gets into the car. Calculate the driver’s weight, weight = the average increase in the pressure of the gas in the cylinders. pressure increase = Explain in detail how the molecules of the gas trapped inside the cylinder by the piston exert a pressure on the cylinder. The temperature of the trapped gas remains constant. Explain why the pressure of the gas increases as the piston is moved further into the cylinder. At the end of a long journey, the temperature of the trapped gas in the shock absorbers has increased substantially. State what happens to the molecules of the trapped gas due to the temperature increase. State and explain the effect of the increased temperature of the gas on the height of the car body above the road surface.
5054_w10_qp_21
THEORY
2010
Paper 2, Variant 1
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A gas is trapped at atmospheric pressure in a cylinder by a piston. The piston is held in a fixed position by a movable rod. shows the cylinder. piston rod cylinder trapped gas The cylinder is heated. As the temperature of the gas increases, its pressure increases. Explain, in terms of molecules, why the pressure of the trapped gas increases. The rod is pulled down and the piston is then free to move as shown in . trapped gas piston cylinder rod As the piston moves, the temperature of the gas remains constant. State and explain, in terms of molecules, what happens to the pressure of the gas.
5054_w15_qp_22
THEORY
2015
Paper 2, Variant 2
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Gas is trapped in a syringe by a piston. shows that the narrow end of the syringe is sealed. syringe sealed end gas piston When the gas is at a pressure of 1.1 × 105 Pa, it occupies a volume of 40 cm3. Explain, in terms of the molecules, how the gas exerts a pressure on the inside of the syringe. The piston is slowly pulled to the right until the volume occupied by the gas is 110 cm3. The temperature of the gas does not change. Calculate the new pressure of the gas. pressure =
5054_w16_qp_22
THEORY
2016
Paper 2, Variant 2
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Questions Discovered
86