JEE Main 2022 (Online) 25th June Evening Shift | Circular Motion Question 33 | Physics

JEE Main 2022 (Online) 25th June Evening Shift

MCQ (Single Correct Answer)

-1

A disc with a flat small bottom beaker placed on it at a distance R from its center is revolving about an axis passing through the center and perpendicular to its plane with an angular velocity $$\omega$$. The coefficient of static friction between the bottom of the beaker and the surface of the disc is $$\mu$$. The beaker will revolve with the disc if :

$$R \le {{\mu g} \over {2{\omega ^2}}}$$

$$R \le {{\mu g} \over {{\omega ^2}}}$$

$$R \ge {{\mu g} \over {2{\omega ^2}}}$$

$$R \ge {{\mu g} \over {{\omega ^2}}}$$

JEE Main 2022 (Online) 25th June Evening Shift

MCQ (Single Correct Answer)

-1

For a particle in uniform circular motion, the acceleration $$\overrightarrow a $$ at any point P(R, $$\theta$$) on the circular path of radius R is (when $$\theta$$ is measured from the positive x-axis and v is uniform speed) :

$$ - {{{v^2}} \over R}\sin \theta \widehat i + {{{v^2}} \over R}\cos \theta \widehat j$$

$$ - {{{v^2}} \over R}\cos \theta \widehat i + {{{v^2}} \over R}\sin \theta \widehat j$$

$$ - {{{v^2}} \over R}\cos \theta \widehat i - {{{v^2}} \over R}\sin \theta \widehat j$$

$$ - {{{v^2}} \over R}\widehat i + {{{v^2}} \over R}\widehat j$$

JEE Main 2022 (Online) 24th June Evening Shift

MCQ (Single Correct Answer)

-1

A stone of mass m, tied to a string is being whirled in a vertical circle with a uniform speed. The tension in the string is

the same throughout the motion.

minimum at the highest position of the circular path.

minimum at the lowest position of the circular path.

minimum when the rope is in the horizontal position.

JEE Main 2022 (Online) 24th June Evening Shift

MCQ (Single Correct Answer)

-1

A fly wheel is accelerated uniformly from rest and rotates through 5 rad in the first second. The angle rotated by the fly wheel in the next second, will be :

7.5 rad

15 rad

20 rad

30 rad

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