JEE Main 2022 (Online) 26th June Morning Shift | Rotational Motion Question 117 | Physics

A thin circular ring of mass M and radius R is rotating with a constant angular velocity 2 rads^$$-$$1 in a horizontal plane about an axis vertical to its plane and passing through the center of the ring. If two objects each of mass m be attached gently to the opposite ends of a diameter of ring, the ring will then rotate with an angular velocity (in rads^$$-$$1).

$${M \over {(M + m)}}$$

$${{(M + 2m)} \over {2M}}$$

$${{2M} \over {(M + 2m)}}$$

$${{2(M + 2m)} \over M}$$

JEE Main 2022 (Online) 25th June Morning Shift

MCQ (Single Correct Answer)

-1

If force $$\overrightarrow F = 3\widehat i + 4\widehat j - 2\widehat k$$ acts on a particle position vector $$2\widehat i + \widehat j + 2\widehat k$$ then, the torque about the origin will be :

$$3\widehat i + 4\widehat j - 2\widehat k$$

$$ - 10\widehat i + 10\widehat j + 5\widehat k$$

$$10\widehat i + 5\widehat j - 10\widehat k$$

$$10\widehat i + \widehat j - 5\widehat k$$

JEE Main 2021 (Online) 31st August Evening Shift

MCQ (Single Correct Answer)

-1

A system consists of two identical spheres each of mass 1.5 kg and radius 50 cm at the end of light rod. The distance between the centres of the two spheres is 5 m. What will be the moment of inertia of the system about an axis perpendicular to the rod passing through its midpoint?

18.75 kgm²

1.905 $$\times$$ 10⁵ kgm²

19.05 kgm²

1.875 $$\times$$ 10⁵ kgm²

JEE Main 2021 (Online) 31st August Morning Shift

MCQ (Single Correct Answer)

-1

Angular momentum of a single particle moving with constant speed along circular path :

changes in magnitude but remains same in the direction

remains same in magnitude and direction

remains same in magnitude but changes in the direction

is zero