JEE Main 2021 (Online) 27th August Morning Shift | Center of Mass and Collision Question 32 | Physics

JEE Main 2021 (Online) 27th August Morning Shift

MCQ (Single Correct Answer)

-1

Moment of inertia of a square plate of side l about the axis passing through one of the corner and perpendicular to the plane of square plate is given by :

$${{M{l^2}} \over 6}$$

$${M{l^2}}$$

$${{M{l^2}} \over {12}}$$

$${2 \over 3}M{l^2}$$

JEE Main 2021 (Online) 26th August Evening Shift

MCQ (Single Correct Answer)

-1

A particle of mass m is suspended from a ceiling through a string of length L. The particle moves in a horizontal circle of radius r such that $$r = {L \over {\sqrt 2 }}$$. The speed of particle will be :

$${\sqrt {rg} }$$

$${\sqrt {2rg} }$$

$${2\sqrt {rg} }$$

$${\sqrt {{{rg} \over 2}} }$$

JEE Main 2021 (Online) 27th July Morning Shift

MCQ (Single Correct Answer)

-1

List-I	List-II
(a) MI of the rod (length L, Mass M, about an axis $$ \bot $$ to the rod passing through the midpoint)	(i) $$8M{L^2}/3$$
(b) MI of the rod (length L, Mass 2M, about an axis $$ \bot $$ to the rod passing through one of its end)	(ii) $$M{L^2}/3$$
(c) MI of the rod (length 2L, Mass M, about an axis $$ \bot $$ to the rod passing through its midpoint)	(iii) $$M{L^2}/12$$
(d) MI of the rod (Length 2L, Mass 2M, about an axis $$ \bot $$ to the rod passing through one of its end)	(iv) $$2M{L^2}/3$$

Choose the correct answer from the options given below:

(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)

(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)

(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)

(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

JEE Main 2021 (Online) 27th July Morning Shift

MCQ (Single Correct Answer)

-1

Three objects A, B and C are kept in a straight line on a frictionless horizontal surface. The masses of A, B and C are m, 2m and 2m respectively. A moves towards B with a speed of 9 m/s and makes an elastic collision with it. Thereafter B makes a completely inelastic collision with C. All motions occur along same straight line. The final speed of C is :

JEE Main 2021 (Online) 27th July Morning Shift Physics - Center of Mass and Collision Question 35 English