What is dot product of two vectors? When two vectors are multiplied with each other and answer is a scalar quantity then such a product is called scalar product or dot product of vectors. A dot (.) is placed between vectors which are multiplied with each other that’s why it is also called “dot product”. Scalar = vector .vector Vector ...

Read More »## Difference between conservative and non conservative forces with examples

What are conservative forces? Those forces which allows the opportunity of two way conversion among potential and kinetic energies are said to be conservative forces. examples conservative forces Gravitational forces Magnetic force Electrostatic force Elastic spring force Electric force what are non conservative forces? The force is called non conservative if work is done by the force is dependent on ...

Read More »## Resistance in series and parallel circuits

Combinations of resistance in electric circuit There are two possible combinations of resistance in electric circuits: Series combination Parallel combination Series combination In series combination,resistors are connected end to end and electric current has a single path through the circuit.This means that the current passing through each resistor is the same. The current is the same through all points in ...

Read More »## Photodiode applications with working and uses

What is Photodiode? The photo diode is the device which operates in reverse bias.The photo diode has small transparent window that allows light to strike the pn junction. Photodiode working We know that when reverse biased ,the rectifier diode has a very small leakage of current.The same is true for photodiode.The reverse biased current is produced by thermally generated electron ...

Read More »## Artificial gravity formula

artificial gravity definition Weightlessness in space crafts or satellites is highly convenient to an astronaut in many ways.For Example he can not drink in it.It is very difficult for him to perform experiments. In order to overcome these difficulties an artificial gravity is created in the space craft by spinning it around its own axis so that normal force of ...

Read More »## Relation between power force and velocity in physics

How is power related to force and velocity? It is some time convenient to express power in terms of constant force (F) acting on an object moving at constant velocity “V” . For example when the propeller of motor boat causes the water to exert constant force on the boat,it moves with constant velocity v .The power delivered by motor ...

Read More »## Power equation physics:definition,unit ,dimension and problems

Power definition The rate of doing work is called power. From the statement of work it is not clear that same amount of work done in one second or in 1 hour.The rate at which work done is often interest in practical applications. Power formula physics Average power formula The ratio of total work to the total time is called ...

Read More »## First equation of motion in physics

First equation of motion derivation Consider a body is moving with initial velocity “Vi” with uniform acceleration “a” as shown in figure.After time “t” its velocity becomes “Vf”.The total distance covered by a body is under the straight line AB which is shaded as shown in figure.The slope of line AB is acceleration “a”.1st equation of motion can be obtained ...

Read More »## Difference between reversible and irreversible process in thermodynamics with examples

Reversible and irreversible process Reversible process in thermodynamics “A process which can be retracted in exactly reverse order without producing any change in the surroundings is called reversible process”. In the reverse process, the system passes through the same stages as in the direct process but thermal and mechanical effects at each stage are exactly reverse. If heat is absorbed ...

Read More »## Do interference effects occur for sound waves?

Yes,interference effect occurs for sound waves despite of the fact that sound waves are longitudinal waves.When two sound waves of same frequency and same amplitude in the same direction superpose then the interference of sound waves occurs. For example two loudspeakers emit two harmonic sound waves of fixed frequency produced by an audio generator.When these waves combine at a point ...

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