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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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Kepler's 3 Laws of planetary motion.

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 Kepler's Laws


Kepler's First Law :

                             The orbit of a planet is an ellipse with the sun at one of the foci.

The given figure shows that elliptical orbit of a planet revolving around the sun. The position of the sun is indicated by S.

what is High and low tides 


Kepler's Second Law :

                             The line joining the planet and the sun sweeps equal area in equal intervals of a time.

AB and CD are distance covered by the planet in equal time i.e. after equal intervals of a time, the position of a planet starting from A and C are shown by B and D respectively. The straight lines AS and CS sweeps equal are in equal intervals of time i.e. area ASB and CSD are equal.

Kepler's Third Law :

                              The square of of its period of revolution around the sun is directly proportional to the cube of the mean distance of a planet from the sun.

Thus, if r is the average distance of the planet from the sun and T is its period of revolution then, T^2 a r^3 i.e. T^2/r^3 = constant = K

 

Kepler obtained these laws simply from the study of the position of planets obtained by regular observations. 

What is the value of g

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