Centre of Mass

Every physical system has associated with it a certain point whose motion   characterises the motion of the whole system. When the system moves under some external forces, then the point moves as if the entire mass of the system is concentrated at this point and also the external force is applied at this point for Read more about Centre of Mass[…]

Water (H2O)

Physical properties: The hydrogen bonding between the water molecules leads to its high freezing point, high boiling point, high heat of vaporization and fusion. Covalent compounds dissolve in water due to hydrogen bonding with polar molecules. Structure of water: 1. In gas phase: Bent molecule with bond angle 104.5˚. O-H bond length: 95.7pm. Highly polar Read more about Water (H2O)[…]

Calorimetry

When two bodies (one being solid and other liquid or both being liquid) at different temperatures are mixed, heat will be transferred from body at higher temperature to a body at lower temperature till both acquire same temperature. The body at higher temperature releases heat while body at lower temperature absorbs it, so that Heat Read more about Calorimetry[…]

Bernoulli’s Theorem

Statement: When an incompressible and non-viscous liquid (or gas) flows in streamlined motion from one place to another, then at every point of its path the total energy per unit volume is constant. That is  = constant. P + ½ ρv² + ρgh = constant Thus, Bernoulli’s theorem is in one way the principle of conservation Read more about Bernoulli’s Theorem[…]

Hydrogen peroxide (H2O2)

It is also called as oxygenated water (H2O – O) In its pure form it is a colorless liquid, slightly more viscous than water Structure:  Hydrogen peroxide (H2O2) is a non-planar molecule. It has half opened book structure. Two oxygen atoms lying on spine of the book with O – O peroxy linkage and 2 ‘H’ atoms on each leaf of Read more about Hydrogen peroxide (H2O2)[…]

Applications of Bernoulli’s Theorem

(i) Attraction between two closely parallel moving boats (or buses): When two boats or buses move side by side in the same direction, the water (or air) in the region between them moves faster than that on the remote sides. Consequently in accordance with Bernoulli’s principle the pressure between them is reduced and hence due Read more about Applications of Bernoulli’s Theorem[…]