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# Pressure

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### Pressure

1. 1. Pressure <br />Notes<br />P = F / ALiquids: P = h ρ g<br />Workout Questions<br /><ul><li>What must the minimum water pressure in a pipe at ground level be in order to pump water up a building 800 m high? [ Density of water = 1000 kg m-3 ]
2. 2. 8 x 103
3. 3. 8 x 104
4. 4. 8 x 105
5. 5. 8 x 106
6. 6. A mountain climber brings a barometer up a mountain with him. What does he observe about the mercury level?
7. 7. It is lower than when he was at ground level, because the pressure has increased
8. 8. It is lower than when he was at ground level, because the pressure has decreased
9. 9. It is higher than when he was at ground level, because the pressure has increased
10. 10. It is higher than when he was at ground level, because the pressure has decreased
11. 11. Two solid cubes made of the same material are placed side by side. The length of each side of the second cube is three times the length of each side of the first cube. Which of the following statements is correct?
12. 12. Both cubes exert equal pressure on the ground
13. 13. The second cube exerts twice the pressure that the first cube exerts on the ground
14. 14. The second cube exerts four times the pressure that the first cube exerts on the ground
15. 15. The second cube exerts eight times the pressure that the first cube exerts on the ground
16. 16. As a bubble rises from the bottom of the sea to the top, what happens to the air inside it?
17. 17. Both the density and the pressure increase
18. 18. Both the density and the pressure decrease
19. 19. The density increases and the pressure decreases
20. 20. The density decreases and the pressure increases
21. 21. The pressure at a point at the bottom of a bottle of coke does not depend on
22. 22. The density of the coke
23. 23. The level of coke in the bottle
24. 24. Gravity
25. 25. The radius of the bottle
26. 26. A narrow capillary tube with one side open is held inverted with the closed side on the top. There is a column of trapped air held by a mercury plug of length 7cm. What is the pressure of the trapped air? [ Atmospheric pressure = 76 cm Hg ]
27. 27. 69 cm Hg
28. 28. 76 cm Hg
29. 29. 83 cm Hg
30. 30. 100 cm Hg
31. 31. There is trapped air in a capillary tube held by a 10 cm long column of mercury. Atmospheric pressure is 76 cm Hg. What is the pressure of the trapped air when the tube is held parallel to the ground?
32. 32. 66 cm Hg
33. 33. 76 cm Hg
34. 34. 86 cm Hg
35. 35. 760 cm Hg
36. 36. An alien has a mass of 20 kg. Acceleration due to the gravitational force of his planet is 5 ms -1. He has five feet of surface areas 1 m2, 2 m2, 3 m2, 4 m2and 5 m2. What is the pressure exerted on the ground by its foot of surface area 4 m2?
37. 37. A U-shaped tube holds water and liquid X of height 6 cm. The density of water is 1000 kg m -3 and the acceleration due to gravity is 10 m s -2.
38. 38. 10cmWater Liquid X</li></ul>2cm<br /><ul><li>Is liquid X denser or less dense than water? Explain why you think so.
39. 39. ________________________________________________________________________
40. 40. ________________________________________________________________________
41. 41. Calculate the density of liquid X.
42. 42. The tank contains water. The cross sectional area of the water column on the left is 3 cm2 and the cross sectional area of the water column on the right is 9 cm2. Calculate the weight of the block.
43. 43. 6cm10cmblock