Surface Tension: Cohesion, Adhesion, and Capillary Rise

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Questions and Answers

What should you do when you notice a teammate looks worried?

  • Report their behavior to a supervisor immediately
  • Assume they want to be left alone
  • Acknowledge their feelings and offer support (correct)
  • Ignore their feelings and continue with your tasks

As a newly promoted supervisor, how should you approach your first team meeting?

  • Acknowledge your nervousness and connect with your team (correct)
  • Avoid eye contact to appear professional
  • Act in an authoritarian manner to establish dominance
  • Delegate all responsibilities to senior team members

How do you address a very angry customer whose flights are delayed?

  • Politely tell them there's nothing you can do to help
  • Argue with them about the airline's policies
  • Listen to their concerns, empathize, and find a solution (correct)
  • Threaten to call security if they don't calm down

What action demontrates self-awareness regarding an invitation to a party that will end late?

<p>Decline the invitation to ensure you get enough sleep (C)</p> Signup and view all the answers

What is a crucial first step when facing an upset customer?

<p>Listen attentively to their complaints (D)</p> Signup and view all the answers

Flashcards

Self-awareness

Recognizing and understanding your own emotions and how they affect others.

Self-regulation

Managing your emotions, controlling impulses, and adapting to changing circumstances.

Empathy

Understanding and responding to the emotions of others.

Motivation

Motivating yourself to achieve goals, taking initiative, and persevering in the face of setbacks.

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Social skills

Managing relationships, communicating effectively, and building rapport with others.

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Study Notes

  • Tension superficial is an effect that resides on the surface of a liquid that causes it to behave like an elastic membrane
  • This is due to the molecules inside the liquid are surrounded by other molecules, experiencing forces of attraction between them in all directions

Cohesion and Adhesion

  • Cohesion forces are intermolecular attraction forces between similar molecules
  • Cohesion forces are responsible for phenomena such as surface tension
  • Adhesion forces are the attraction forces between different molecules

Contact Angle

  • The contact angle is the angle formed at the point where a drop of liquid contacts a solid surface
  • This angle provides information about the interactions between the liquid and the solid
  • θ < 90°: The liquid wets the surface (adhesion > cohesion)
  • θ > 90° The liquid does not wet the surface (cohesion > adhesion)

Capillary Rise

  • Capillary rise is the ability of a liquid to flow in narrow spaces without the assistance of external forces such as gravity
  • This is due to the combination of surface tension and the adhesion forces between the liquid and the duct walls
  • The height reached by the liquid in a capillary tube is given by Jurin's Law:
  • $$h = \frac{2\gamma \cos\theta}{\rho g r}$$
  • h is the height of the liquid in the tube
  • γ is the surface tension of the liquid
  • θ is the contact angle
  • ρ is the density of the liquid
  • g is the acceleration due to gravity
  • r is the radius of the tube

Implications

  • Surface tension has many everyday implications
  • Formation of drops
  • Ability of some insects to walk on water
  • Water absorption by plants
  • Action of detergents

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