## Centre of mass formula list with solved examples and problems

This article contains a list of the center of mass formulas along with some center of mass problems and examples. Center of mass formula list For a system of N particles,the position vector of center of mass is $\vec{R}_{CM}=\frac{m_1\vec{r}_1+m_2\vec{r}_2+………..+m_N\vec{r}_N}{m_1+m_2+…..+m_N}=\frac{\sum_{i=1}^N{m_i\vec{r}_i}}{M}$ The position vector of … Read more

## Electric charge concept

In this article learn about electrical or electric charge concepts with the help of some questions and answers.Diverse phenomenons known in nature are based on four fundamental interactions among particles and they are Strong interactions Weak interactions Electromagnetic interactions Gravitational interactions Each of … Read more

## Thermodynamics Multiple Choice Questions and Answers

PART A Question 1 In a given process on an ideal gas, $dW>0$ and $dQ=0$.Then for the gasa) Temperature will decreaseb) Temperature will increasec) volume will decreased) none of above Question 2A cylinder of diameter $D$ and of thermal conductivity $k$ is surrounded … Read more

## Coherent Sources of light

Coherent sources are those sources of light that emit continuous light waves of the same wavelength, same frequency, and are in the same phase or have a constant phase difference. For observing the interference phenomenon coherence of light waves is a must. For … Read more

## The maximum range of projectile formula

Let us consider a projectile projected with initial velocity $$v_{0}$$ making an angle $$\theta_0$$ with the horizontal as shown below in the figure. We know that the horizontal range of a projectile is the distance traveled by the projectile during its time of … Read more

## Current electricity equations and formulas (Direct Current)

In this article find the list of current electricity equations or current electricity formulas. Current electricity is related to the flow of electrons. Current electricity is of two types: DC or direct current  AC or alternating current In this article, we will concern … Read more

## Tricks to solve pulley problems

A lot of problems in mechanics involves string, pulley and springs for example masses are attached to string or spring and so on. Here in this article learn about some Tricks to solve pulley problems .Here find the concepts you need to remember while solving … Read more