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The unit of surface tension is
发布时间:
2024-06-30 18:16:37
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相关试题
1.
The main components and functions of surfactant on the surface of the lung.选项: A:Phospholipids, increase the surface tension of alveoli; B:Phospholipids, decrease the surface tension of alveoli; C:proteins, Increase the surface tension of alveoli; D:proteins, decrease the surface tension of alveoli; E:Protein, protect epithelium in lung
2.
Which of the following statements about the surface tension of water is WRONG?选项: A:Compared to other liquids at the same temperature, water has an extremely high surface tension.; B:If the air-water interface is curved, surface tension produces a net force perpendicular to the interface.; C:“Wettable” surfaces have contact angles of greater than 90°; “nonwettable” surfaces have contact angles of less than 90°; D:None
3.
Insects that skim over a water surface____ surface tension.选项: A:take advantage of; B:take a whack at; C:take a view of; D: take account of
4.
In surface roughness, the unit of Ra is ( )选项: A:mm B:m C:cm D:um
5.
The retraction force of the lung mainly comes from 选项: A、alveolar elastic fibers B、surface tension of liquid molecular layer of alveoli C、thoracic elastic retraction D、alveolar surfactant
6.
______ is the breakdown of surface tension between oil droplets in an oil/ water mixture which cause them to join and increase in size. 选项: A、Coarse fitting B、Fine separating C、Mixing D、Coalescence
7.
According to the formula by Stefan (1874), the retention force between two circular disks is inversely proportional to ( )选项: A:radius of the disk B:the liquid viscosity C:the surface tension of the liquid film D:the square of the distance between the discs
8.
The following phenomena have nothing to do with the surface tension of the liquid ( ) 选项: A、Rain drops fall on lotus leaves to form drops of water B、Some small insects walk on the water C、Paper clips can float on the water D、The ship is able to sail on the water
9.
tension tension 选项:A、张 力、拉力
10.
Which of the following is the reason why that increasing the viscosity of an emulsion improves its stability?选项: A:Higher viscosity increase the density of the emulsion.; B:Higher viscosity reduces surface tension.; C:Higher viscosity can form a thick ; D:Higher viscosity can slow down the approach process.
11.
Two blocks, joined by a string, have masses of 6.0 and 9.0 kg. They rest on a frictionless horizontal surface. A 2nd string, attached only to the 9-kg block, has horizontal force = 30 N applied to it. Both blocks accelerate. The tension in the string between the blocks is _____ N.
12.
Which of the following is the reason why that increasing the viscosity of an emulsion improves its stability?选项: A:Higher viscosity increase the density of the emulsion.; B:Higher viscosity reduces surface tension.; C:Higher viscosity can form a thick layer around the droplet; D:Higher viscosity can slow down the approach process.
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