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# DC Pandey Fluid Mechanics Solutions

DC Pandey Mechanics Part 1 Solutions for Chapter 8 ‘Centre of Mass, Conservation of Linear Momentum, Impulse and Collision’ has all the essential concepts of the chapter for your JEE Mains and Advance preparations. In this chapter of DC Pandey Physics Book Solutions, you will study the concepts of the centre of mass, the law of conservation of linear momentum, variable mass, impulse, collision and position of the centre of mass. It also includes concepts of motion of the centre of mass, rocket repulsion, types of collisions like elastic and inelastic collisions and head-on collision or oblique collision.

The chapter has a total of 7 introductory exercises and 2 separate corners for AIEEE (now JEE Mains) and JEE competitive exams. The questions given in the section of competitive exams have been picked after thorough research of previous years’ questions and exam pattern. Once you engage with all the questions given in DC Pandey Mechanics Part 1 Centre of Mass, Conservation of Linear Momentum, Impulse and Collision Chapter, you will be able to solve questions regarding the position of the centre of mass at different instants, variable mass, collision, the magnitude of momentum and impulse easily.

DC Pandey Mechanics Part 1 Centre of Mass, Conservation of Linear Momentum, Impulse and Collision Solutions have been carefully formulated by our subject experts who have ensured that all your confusions and queries are solved at one place. Our study material is remarkably useful for your exam preparations with all the significant pointers, questions and concepts compiled at one place. With the support of our Instasolv Team, you will definitely stand out and give a notable boost to your academics.

## Important Topics for DC Pandey Mechanics Part 1 Chapter 8: Centre of Mass, Conservation of Linear Momentum, Impulse and Collision

Types of Equilibrium

In your previous classes, you would have studied that equilibrium refers to a state when the net force which acts on a body is null. In this chapter of DC Pandey Mechanics Part 1, you will learn an advanced version of this concept and the different kinds of equilibrium.

1. Stable Equilibrium – in this state, when a body is displaced from its equilibrium position it is acted upon by a net restoring force which works at bringing the body back to its initial equilibrium position. The potential energy in equilibrium position is minimum as compared to the neighbouring points. In this case, when a body is displaced from equilibrium, the position of its centre of gravity goes in the upward direction.
2. Unstable Equilibrium – in this state of equilibrium, when a body is displaced from its equilibrium position, it is acted upon by a net force which tends to move the body away from its initial equilibrium position. The potential energy in equilibrium position is maximum as compared to the neighbouring points. In this case, when a body is displaced from equilibrium, the position of its centre of gravity goes in the downward direction
3. Neutral Equilibrium – in this case, when a body is displaced from its equilibrium position, it neither has the tendency to restore to its initial position nor can it move away from it. The potential energy in equilibrium position remains constant even after being displaced from its initial position. In this case, when a body is displaced from equilibrium, the position of its centre of gravity remains in the same position.

Law of Conservation of Linear Momentum

In this chapter of Centre of Mass, Conservation of Linear Momentum, Impulse and Collision, you will learn about the law of conservation of linear momentum which states that the net external force which acts upon a system of bodies is null when the momentum of that system remains constant. You will get to know that the momentum of the system is conserved but the same does not apply to the individual particles of that system. Their individual momentum might experience an increase or a decrease depending on their condition. But the entire momentum of the system remains in a conserved state until an external force is applied to the system.

### Exercise-wise Discussions of DC Pandey Mechanics Part 1 Chapter 8: Centre of Mass, Conservation of Linear Momentum, Impulse and Collision

Introductory Exercise 8.1

• This exercise has a total of 9 questions that include theory-based questions like the difference between the centre of mass and centre of gravity and true-false statements.

Introductory Exercise 8.2

• This exercise has 2 questions only that revolve around displacement and magnitude of momentum.

Introductory Exercise 8.3

• There are 7 questions in this exercise. These include problems revolving around the mass, projectile motion, angle of projection and mutual interaction.

Introductory Exercise 8.4

• The exercise comprises 3 questions. It includes questions regarding rocket movements, exhaust velocity and mass.

Introductory Exercise 8.5

• There are 3 questions in this exercise related to the equations of velocity and impulse.

Introductory Exercise 8.6

• There are a total of 7 questions in this exercise. The questions include simple conceptual problems based on equivalent masses, the transference of energy and elastic collision.

Introductory Exercise 8.7

• The exercise has 4 questions
• It deals with topics like oblique collision, coefficient of restitution and velocity

Introductory Exercise 8.8

• There are 6 questions in this exercise. It deals with numerical problems which tackle concepts like collision, stationery state, horizontal range and elastic collision.

AIEEE (now a part of JEE)

• The exercise has two different sections – Objective Questions and Subjective Questions.
• The objective section contains 35 questions which revolve around the centre of mass, uniform solid spheres, conservation of linear momentum, kinetic energy at an instant and collision.
• The subjective section comprises of 43 questions which deal with energy conservation, velocity equations, impulsive force, inelastic collision and momentum

JEE Corner

• This exercise has 5 separate sections. The first section contains Assertion and Reason questions and has a total of 15 problems revolving around the centre of mass of a rigid body, kinetic energy, vertically upward force and gravitational force.
• The second section has 31 Objective Questions. The questions in this section deal with pendulum mechanics, circular tracks, inextensible string, imparted momentum and equilateral surfaces.
• The third section is of More than one correct Option questions. The exercise has 8 questions in total.
• The second last section contains Match the columns which have 8 different sets of information.
• The last section has a Subjective Question which has 19 questions in total and tackles concepts like block system, velocity on frictionless surfaces, deflection and collision.

## Why Use DC Pandey Mechanics Solutions Part 1 Chapter 8 by Instasolv?

• We make sure that all the DC Pandey Mechanics Part 1 Solutions are formulated in a simple language with detailed step by step explanations.
• Our team of experts has ensured that each and every question has been tackled and no corner from the chapter has been left untouched.
• All our solutions are in accordance with the latest syllabus for class 11 and class 12 Physics.
• These solutions would also guide you the best for JEE Mains and JEE Advanced preparations.
• Our solutions for DC Pandey Mechanics Part 1 Chapter 8 ‘Centre of Mass, Conservation of Linear Momentum, Impulse and Collision’ will help you in revising and preparing for your exams at one go.
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