Question

1. Explain what happens to a sealed metal can when the air is removed from it.
2. Draw labelled diagrams to show what happens to a column of mercury when the air pressure is reduced.
3. If you inverted a tube of mercury 1.5 metres long in a dish of mercury, roughly how long would the vacuum space be above the mercury in the tube?
4. In your own words, describe how a device which measures air pressure can also measure height.
5. Why do the cabins of passenger aircraft need to be pressurized' whilst flying at high altitudes? How do you think an aircraft is pressurized?
6. An elephant weighs 40,000 newtons. Each of its four feet has an area of 500 cm . If the elephant stands on one foot, what pressure does it put on the ground?
7. A lady weighing 500 newtons has shoes with stiletto heels. Each heel has an area of 0.5 cm². If the lady puts all her weight on one heel, what pressure does she put on the floor. Would you rather have your toe stepped on by the lady in stiletto heels, or the elephant, described in the previous question? Why?

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Answer 1

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