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The angle of contact for liquid on a solid surface is the angle between:
  • a)
    the tangent to the liquid surface at the point of contact and the solid surface
  • b)
    the tangent to the solid surface at the point of contact and the liquid surface
  • c)
    the liquid surface and the solid surface at the point of contact
  • d)
    none of these
Correct answer is option 'A'. Can you explain this answer?
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The angle of contact for liquid on a solid surface is the angle betwee...
The angle of contact for liquid on a solid surface is the angle between the tangent to the liquid surface at the point of contact and the solid surface. This is the definition of angle of contact.
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The angle of contact for liquid on a solid surface is the angle betwee...
The angle of contact for liquid on a solid surface is the angle between the tangent to the liquid surface at the point of contact and the solid surface.

Explanation:
When a liquid comes in contact with a solid surface, it forms a meniscus at the point of contact. The angle of contact is the angle between the tangent to the liquid surface at the point of contact and the solid surface. This angle is important in understanding the wetting properties of a liquid on a solid surface.

To better understand this concept, let's consider a drop of liquid on a solid surface. At the point of contact, the liquid forms a curved shape known as the meniscus. The shape of the meniscus depends on the intermolecular forces between the liquid and the solid. These forces can be classified into three types: adhesive forces, cohesive forces, and gravitational forces.

Adhesive forces are the forces of attraction between the molecules of the liquid and the molecules of the solid. Cohesive forces are the forces of attraction between the molecules of the liquid itself. Gravitational forces are the forces acting on the liquid due to gravity.

The angle of contact is determined by the balance between these forces. If the adhesive forces are stronger than the cohesive forces, the liquid will spread over the solid surface, resulting in a small angle of contact. This is known as a wetting liquid.

On the other hand, if the cohesive forces are stronger than the adhesive forces, the liquid tends to form droplets on the solid surface, resulting in a large angle of contact. This is known as a non-wetting liquid.

The angle of contact also determines the shape of the meniscus. If the angle of contact is less than 90 degrees, the meniscus is concave, while if the angle of contact is greater than 90 degrees, the meniscus is convex.

Overall, the angle of contact provides information about the wetting properties of a liquid on a solid surface and is determined by the balance between adhesive and cohesive forces. Therefore, the correct answer is option 'A', which states that the angle of contact is the angle between the tangent to the liquid surface at the point of contact and the solid surface.
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The angle of contact for liquid on a solid surface is the angle betwee...
The solid surface tends to make an angle with the liquid which is its tangent
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Bearing:Bearings are used to convert sliding friction into rolling friction. Metal-upon-metal contact produces large amounts of friction. The friction adds to wear and tear of the metal, producing grinding that slowly degrades the metal. Bearings reduce friction by having the two surfaces roll over each other. They consist of a smooth metal ball or roller that rolls against a smooth inner and outer metal surface. The rollers or balls take the load, allowing by the device to spin. The two basic types of rolling element distinguish the two basic types of rolling bearing:• ball → ball bearing• roller → roller bearingBalls make point contact with the ring raceways. With increasing load acting on the bearing, the contact point becomes an elliptical area. The small contact area provides low rolling friction, which enables ball bearings to accommodate high speeds but also limits their load-carrying capacity.Rollers make line contact with the ring raceways. With increasing load acting on the bearing, the contact line becomes somewhat rectangular in shape. Because of the larger contact area and the consequently higher friction, a roller bearing can accommodate heavier loads, but lower speeds, than a same-sized ball bearing.In ball bearing, contacts are

Bearing:Bearings are used to convert sliding friction into rolling friction. Metal-upon-metal contact produces large amounts of friction. The friction adds to wear and tear of the metal, producing grinding that slowly degrades the metal. Bearings reduce friction by having the two surfaces roll over each other. They consist of a smooth metal ball or roller that rolls against a smooth inner and outer metal surface. The rollers or balls take the load, allowing by the device to spin. The two basic types of rolling element distinguish the two basic types of rolling bearing:• ball → ball bearing• roller → roller bearingBalls make point contact with the ring raceways. With increasing load acting on the bearing, the contact point becomes an elliptical area. The small contact area provides low rolling friction, which enables ball bearings to accommodate high speeds but also limits their load-carrying capacity.Rollers make line contact with the ring raceways. With increasing load acting on the bearing, the contact line becomes somewhat rectangular in shape. Because of the larger contact area and the consequently higher friction, a roller bearing can accommodate heavier loads, but lower speeds, than a same-sized ball bearing.In roller contacts are

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The angle of contact for liquid on a solid surface is the angle between:a)the tangent to the liquid surface at the point of contact and the solid surfaceb)the tangent to the solid surface at the point of contact and the liquid surfacec)the liquid surface and the solid surface at the point of contactd)none of theseCorrect answer is option 'A'. Can you explain this answer?
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