Choose the correct answer: 2 points The adhesive force causes the mercury to be reduced in the glass capillary tubes. The cohesive force causes the mercury to be reduced in the glass capillary tubes. 2 points A liquid rises a height y in a capillary tube by: pgry=2y cos(30) A liquid rises a height y in a capillary tube by: pgry=2y cos(120) 2 points dp/dy--pg, that is to mean, p decreases when y increases. dp/dy=pg, that is to mean, when y increases, then p decreases.
2 points when comparing a high-density liquid with a low-density liquid, we notice that the length of the thick liquid column is less than the less-density liquid. when comparing a high-density liquid with a low-density liquid, we notice that the length of the thick liquid column is more than the less-density liquid. 2 points The stress at a perpendicular section can be resolved into a normal stress Fn/A and tangential stress Ft/A The stress at a perpendicular section equal F/A.