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Adhesive and Cohesive Forces. Surface Tension and Capillarity

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9.7Adhesive and Cohesive Forces. Surface Tension and Capillarity

Adhesive and Cohesive Forces. Surface Tension and Capillarity Revision Questions

1. The surface tension of methanol in 20° C is 22.50 mN/m. What is the radius of the tube is a methanol sample poured in this tube, produces a 1 mN force of surface tension?

  1. 7 cm
  2. 70 cm
  3. 7 mm
  4. 0.7 mm

Correct Answer: C

2. What would be the value of the tube radius in a mercury barometer in normal atmospheric pressure to measure correctly the air pressure, if the air from the upper part of the tube was not removed? Take the density of mercury equal to 13 600 kg/m3 and gravitational field strength as 9.81 m/s2. Also, take the surface tension of mercury equal to 0.486 N/m.

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  1. 9.586 × 10-6 m
  2. 9.59 mm
  3. 4.793 × 10-6 m
  4. 4.79 mm

Correct Answer: A

3. A 0.15 g water mixed with soap produces a soap film when inserted into a rectangular frame whose one end can shift freely. As a result, the frame surface can be enlarged or reduced as needed. The frame is kept in a horizontal position.

Physics Tutorials: This image provides visual information for the physics tutorial Adhesive and Cohesive Forces. Surface Tension and Capillarity

Given that the moveable side (and its opposite side as well) is 4 mm long, what is the maximum length of the other side xmax so that the soap film does still exist? Take the surface tension of soap film equal to 0.03 N/m, g = 10 m/s2.

  1. 21 mm
  2. 5 mm
  3. 1 mm
  4. 2 mm

Correct Answer: A

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