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The outer surface of a beaker containing ice cubes becomes wet in short while - Give scientific reason.

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Question  The outer surface of a beaker containing ice cubes becomes wet in short while. Answer  When ice cubes are placed in a beaker, ice starts melting.  The heat required for melting is absorbed from the surrounding air and also from the beaker to some extent.  Hence, the temperature of the air and beaker falls.  The capacity of air to hold water vapour depends upon the temperature of the air, and this capacity decreases as the temperature decreases.  At a certain low temperature, the surrounding air becomes saturated with water vapour present in it.  As the temperature falls further, the air is unable to hold all the water vapour.  Hence, the extra water vapour starts condensing on the cold outer surface of the beaker in the form of minute drops.  Therefore, The outer surface of the beaker containing ice cubes becomes wet in a short while.
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Circular Motion And Centripetal Force

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Circular Motion And Centripetal Force



what is weightlessness in space

What is Gravitational Force

Tie the stone to one end of a string. Take the other end in your hand and rotate the string so that the stone moves along a circle as shown in given figure. 


As long as we are holding the string, we are pulling the stone towards us i.e. toward the center of the center and applying a force towards it. The force stops acting if we released the string, in this case, the stone will fly of along a straight line which is tangent of the circle at the position of the stone when the string is released, because that is the direction of its velocity at that instant of time {figure: b}. You may recall that we have performed a similar activity previously in which a 5 rupee coin kept on a rotating circular disk files off the disk along the tangent to the disk. Thus, a force acts on any object moving along a circle and it is directed towards the center of the circle. This is called the Centripetal force. 

Gravitational waves 


'Centripetal' means center seeking i.e. the object tries to go towards the center of the circle because of this force.


You know that the moon, which is the natural satellite of the earth, goes around it in a definite orbit. The direction of a motion of the moon as well as its speed constantly changes during the motion. 

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