A sealed pneumatic lifting cushion is used to support a machine. The cushion contains a fixed mass of gas. The temperature of the gas remains constant.
| quantity | before the machine is lowered | while supporting the machine |
|---|---|---|
| volume of gas | 600 cm3 | 450 cm3 |
| pressure of gas | 300 kPa | not measured |
| area of the upper surface | — | 200 cm2 |
Calculate the force exerted by the gas on the upper surface of the cushion while it is supporting the machine.
108 exam-style questions on Edexcel GCSE Physics 14.3 Gas pressure and temperature, covering 14.3.1 Gas pressure and particle motion, 14.3.2 Temperature and pressure at constant volume, 14.3.3 Absolute zero and the kelvin scale, 14.3.4 Compressing and expanding gases, 14.3.5 Volume and pressure at constant temperature, and 14.3.6 Doing work on a gas. Each one has a worked solution and a mark scheme showing where the marks go.