Let P be a particle on a smooth plane inclined at an angle alpha to the horizon. If ABC represent a vertical section of the inclined plane through P, AB is the line of greatest…

[Continue reading]# Category: Physics

## Motion under Gravity

When a body falls towards the earth we can notice that its velocity increases as it approaches earth. Hence the falling body is accelerating. Galileo performed several experiment and showed that falling bodies with different…

[Continue reading]## E equal to mc squared derivation

Here is how we derive mass energy equivalence Force is defined as rate of change of momentum i.e., ….. (1) According to the theory of relativity, both mass and velocity are variable. Therefore ….. (2)…

[Continue reading]## The General Theory of Relativity

The special theory of relativity is valid only for inertial systems i.e. Systems moving with constant relative velocity. According to the first postulate of special relativity “the laws of physics may be expressed in equations…

[Continue reading]## Special Relativity

In 1905 Albert Einstein purposed how measurement of time and space are affected by motion between an observer and the object that is being observed. He called this theory the theory of Relativity and there…

[Continue reading]## How to supercool water

At normal atmospheric pressure, water freezes at zero degrees Celsius and boils at 100 degrees. It is to be noted that the freezing and boiling points of water are how we define the Celsius temperature…

[Continue reading]## Units and measurement

The 14th general conference on weight and measurement in 1971 decided seven fundamental quantities as basic quantities. These seven unit of measurement are known as the International System of units along with two supplementary units….

[Continue reading]## Temperature of Earth without Atmosphere

Temperature of Earth without Atmosphere During the day time, when the heat radiation from the sun comes towards the earth, they are reflected back into space by the earth’s atmosphere. As a result, only some…

[Continue reading]## Fan actually increases room temperature

When the fan operates in a closed room, the motion of the air molecules increases. The increase in the motion of the air molecules increases the rate of evaporation of sweat from our body. Due…

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