1

JEE Main 2019 (Online) 10th April Evening Slot

MCQ (Single Correct Answer)

+4

-1

The time dependence of the position of a particle of mass m = 2 is given by $$\overrightarrow r \left( t \right) = 2t\widehat i - 3{t^2}\widehat j$$
. Its angular
momentum, with respect to the origin, at time t = 2 is

2

JEE Main 2019 (Online) 10th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

A thin disc of mass M and radius R has mass
per unit area $$\sigma $$(r) = kr

^{2}where r is the distance from its centre. Its moment of inertia about an axis going through its centre of mass and perpendicular to its plane is :3

JEE Main 2019 (Online) 10th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

Two coaxial discs, having moments of inertia
I

_{1}and I_{1}/2, are rotating with respective angular velocities $$\omega $$_{1 }and $$\omega $$_{1}/2 , about their common axis. They are brought in contact with each other and thereafter they rotate with a common angular velocity. If E_{f}and E_{i}are the final and initial total energies, then (E_{f}- E_{i}) is:4

JEE Main 2019 (Online) 10th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

A particle of mass m is moving along a
trajectory given by

x = x

y = y

The torque, acting on the particle about the origin, at t = 0 is :

x = x

_{0}+ a cos$$\omega $$_{1}ty = y

_{0}+ b sin$$\omega $$_{2}tThe torque, acting on the particle about the origin, at t = 0 is :

Questions Asked from Rotational Motion (MCQ (Single Correct Answer))

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