What is surface tension and an example of surface tension

Surface tension is a film made by water and it's polar characteristic. Since water is polar, it tends to stick together. When something tries to break the surface of water, surface tension comes into play. Simply, surface tension is a sort of film that tries to prevent things from breaking the water's surface. An example would be water on a penny that domes instead of breaking or going flat.

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a.) travels faster in solids because the particles are closer together.

air is a gas water is a liquid

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards