# WBJEE: Important Questions and Preparation Tips – Centre of Mass

Find complete chapter notes of chapter Centre of Mass for WBJEE Examination 2018. About 1-2 questions are always asked from this topic in WBJEE Examination. This article will help students to revise the complete topic in less time.

Created On: Oct 10, 2017 15:57 IST
Modified On: Oct 12, 2017 14:50 IST
WBJEE 2018: Centre of Mass

Students can’t miss any single topic of any subject if they want to get selected in WBJEE Examination 2018. But it is not possible for stduents to revise the complete theory before the examination. To tackle this problem students will have to make notes which should consists of all important concepts, formulae and previous year solved questions. The study of previous year questions helps us to understand the difficulty level of the questions asked in previous year WBJEE Examination. In this article we bring to you the complete chapter notes of chapter Centre of Mass including topics like the centre of mass of two points system, centre of mass of n points system, impulse, thrust etc. These chapter notes are prepared by Subject Expert and are based on the latest syllabus of WBJEE Examination. These notes are in very concise form and can be used for quick revision before the examination.

West Bengal Joint Entrance Examination (WBJEE) is a state level common entrance test organized by West Bengal Joint Entrance Examinations Board for admission to the Undergraduate Level Engineering and Medical Courses through a common entrance test in the State of West Bengal.

WBJEE Syllabus: 2018

Important Concepts:

Important Questions and Preparation Tips – Work Power and Energy

Some important solved questions are given below:

Question 1:

A large number of particles are placed around the origin, each at a distance R from the origin. The distance of the center of mass of the system from the origin is

(A)  = R                                           (B)  ≤ R
(C)  > R                                           (D) ≥ R

Solution 1:

Correct Option: (B)

If OAB is a sector of a circle, radius r, with angle 2α at the centre then the centre of mass lies on line of symmetry such that,

If, arc AB tends to zero then the centre of mass is at distance R from the origin. And as the arc length AB increases, centre of mass starts moving down.

Important Questions and Preparation Tips – Laws of Motion

Question 2:

Two bodies of masses m1 and m2 are separated by a distance R. The distance of the centre of mass of the bodies from the mass m1 is

Solution 2:

Important Questions and Preparation Tips - Thermodynamics

Question 3:

Distance of the centre of mass of a solid uniform cone from its vertex is z0. If the radius of its base is R and its height is h then z0 is equal to

Solution 3:

Correct Option: (A)

Question 4:

Solution 4:

Correct Option: (B)

WBJEE 2014 Solved Physics Question Paper

WBJEE Solved Sample Paper Set-I

रोमांचक गेम्स खेलें और जीतें एक लाख रुपए तक कैश

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