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### 56 Multiple choice questions

1. sink
2. volume
3. Buoyancy Force
4. force, area
5. Pressure applied to a fluid in a closed container is transmitted equally to every point of the fluid and to the walls of the container
6. pressure of each side is the same
7. a fluid that has no internal friction or viscosity and is incompressible
8. rides higher in salt water. Because the density of the water is higher. Which means that the weight of the displaced water is higher, so the ship needs less displaced water to balance it's weight.
9. laminar, turbulent
10. the concentration of the mass of an object, measured in mass per unit volume of a substance
11. areaspeed in region1=area speed in region 2
12. mass density=mass/volume
13. No. Pressure is force per unit area: p=f/a. Thus it does not require a large force to produce a large pressure.
14. fluid
15. mass, volume
16. conservation, mass
17. liquid pressure increases with depth; it increases with density
18. The weight of the teacher would be spread out across the nails rather than all centered on one, preventing the nails going through the body of the teacher.
19. incompressible
20. there is a greater pressure against the bottom
21. flow
22. same
23. atmospheric, free
24. fluid, gases
25. the magnitude of the race on a surface per unit area
26. the pressure in a fluid decreases as the fluid's velocity increases

ex.) as air flows around an airplane wing, air above moves faster than air below, producing a lift
27. Archimedes principal is: "The upward buoyancy force is equal to the magnitude of the weight of fluid displaced by the body". So, the upwards force on the beach ball is equal to the weight ot the water idisplaced when pushed underwater.
28. displaced
29. remains at any level
30. No, a straw will not function on the Moon because there is no atmosphere.
31. less speed and kinetic energy
32. Since pure Oxygen is heavier than air, a balloon filled with Oxygen would sink because of its heavier contents plus the weight of the balloon
33. they are equal
34. afloat
35. Liquids and gases exert pressure equally in all directions.
36. weight, fluid, displaced
37. depth, fluid
38. A1v1 = A2v2
39. opposite direction
40. a nonskid state of matter in which the atoms or molecules are free to move past each other, as in a gas or a liquid
41. perpendicular to the surface of the can
42. Pascal; Pa
43. 1) an object more dense than the fluid in which it is immersed sinks
2) an object less dense than the fluid sinks
3) an object with equal density to the fluid neither sinks nor floats
44. rise to the surface and float
45. Because of the pressure of the water, forces act on the boat. The resulting force is the buoyancy force, which pushes the boat up.
46. 10 N
47. the weight of the displaced water
48. The two are equal because the buoyant force depends only upon the density and volume of the liquid that is displaced.
49. because of buoyancy in water your body comes up stimulating weightlessness.... hence astronauts train underwater
50. density
51. area
52. kilograms per cubic meters
53. the upward force exerted by a liquid on an object immersed in or floating on the liquid
54. depth
55. ideal fluid
56. high, low