physics


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Principle of Homogeneity of Dimensions
Principle of Homogeneity of Dimensions - It states that if the dimensions of each term on both the sides of equation are same, then the physical quantity will be corre..
Increase in area = a2-a1
Rise in temperature = (t 2 -t 1 ) Coefficient of superficial expansion ( b ) ..
Expression for escape velocity
Consider an object of mass 'm' placed on the surface of the earth. According to Newton's law of gravitation, the gravitational pull of the earth on that object is given by Where F is the force of attraction between the earth and the object, M e is the mass of the earth and R e is the radius of the ..
Electric Circuits and their Components
The devices which deliver electricity are called the 'sources'. Lamps, electric engines, etc. which consume electricity are called loads. Switches are used to switch the loads on and off whenever necessary. Hence, the source, the loads, and the switches are connected to form electrical circuits. Th..
Magnifying Power of an Astronomical Telescope
Magnifying power of an astronomical telescope may be defined as the ratio of the angle subtended at the eye by the image to the angle subtended at the eye by the object. From the ray diagram we know that: P l C is the focal length of the objective and P l D is the focal length of the eye pi..
Relation between gravitational field intensity and gravitational potential difference
If M is the mass of a body around which a field exists and m is the test mass placed at a distance r from M in this field then, Potential energy per unit mass is gravitational potential (..
Charles' Law
At a given pressure, the volume of a given mass of a gas is proportional to its absolute temperature. This is Charles' law. From (a), if p is constant in expression (a), we get , which is Charles' ..
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