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# Physics

## NCERT Solutions for Class 11 Physics Chapter 4 Motion in a Plane

Motion in a plane refers to the movement of an object in two dimensions. Unlike one-dimensional motion, where an object moves along a straight line, motion in a plane involves movement along both the x and y axes. Types of Motion in a Plane Projectile Motion: This is the motion of an object projected into …

## NCERT Solutions for Class 11 Physics Chapter 3 Motion in a Straight Line

The Motion in a Straight Line or Rectilinear Motion refers to the motion of an object along a straight line. In this type of motion, the position of the object changes linearly with time along a specific path. Examples: A car moving along a straight road. A stone dropped from a certain height (neglecting air …

## Damped and Forced Oscillation | UPSC Notes

Damped Oscillation and Forced Oscillation are two different phenomena that can affect the behavior of oscillatory systems. Damped Oscillation Definition: Damped oscillation refers to the decay of the amplitude of an oscillating system over time due to the presence of a damping force. The damping force acts against the motion of the system, gradually reducing …

## Simple Harmonic Motion I UPSC Notes

Simple Harmonic Motion (SHM) is a type of periodic motion that occurs when a restoring force proportional to the displacement from the equilibrium position acts on an object. In other words, it is a special form of oscillatory or vibratory motion that repeats itself over time. Key Characteristics of Simple Harmonic Motion Periodic Motion: It …

## Isothermal Process Explained

An isothermal process is a thermodynamic process in which the temperature of a system remains constant throughout the entire process. In other words, the system is in thermal equilibrium with its surroundings at all times, and there is no change in temperature. Key characteristics of an isothermal process include: Constant Temperature: In an isothermal process, …

## The Entropy of the Universe

The concept of entropy in the universe is closely related to the second law of thermodynamics, which states that the entropy of an isolated system tends to increase or remain constant over time in natural processes. The second law implies that the overall entropy of the universe is constantly increasing. Entropy is a measure of …

## Entropy Change Formula

The formula for calculating the change in entropy (∆S) of a system depends on the specific process and conditions involved. Here are some common formulas for entropy change in different scenarios: For a reversible process: ∆S = ∫(dQ / T)In this formula, ∆S represents the change in entropy, dQ is an infinitesimal amount of heat …

## Enthalpy and Entropy: Differences Explained

Enthalpy and entropy are two fundamental concepts in thermodynamics that describe different aspects of a system. Enthalpy: Enthalpy (H) is a thermodynamic property that accounts for the total heat content of a system. It combines the internal energy of the system with the product of pressure and volume. Enthalpy is particularly useful in the context …

## Unit of Entropy

The unit of entropy depends on the system of units being used. In the International System of Units (SI), the unit of entropy is the joule per kelvin (J/K). This unit combines the unit of energy, the joule (J), with the unit of temperature, the kelvin (K). The joule is the SI unit of energy, …

## Reversible and Irreversible Processes in Thermodynamics

In thermodynamics, processes can be classified as reversible or irreversible, depending on the manner in which they occur and the characteristics of the system involved. These classifications are important for understanding the efficiency, feasibility, and behavior of thermodynamic processes. Reversible Processes: A reversible process is an idealized concept that describes a hypothetical process that can …