COMEDK 2023 Evening Shift | Rotational Motion Question 5 | Physics

A wheel is free to rotate about a horizontal axis through O. A force of $$200 \mathrm{~N}$$ is applied at a point $$\mathrm{P} 2 \mathrm{~cm}$$ from the center $$\mathrm{O}$$. OP makes an angle of $$55^{\circ}$$ with $$\mathrm{x}$$ axis and the force is in the plane of the wheel making an angle of $$25^{\circ}$$ with the horizontal axis. What is the torque?

4 N m

3.2 N m

2 N m

3.4 N m

COMEDK 2022

MCQ (Single Correct Answer)

-0

A disc of moment of inertia 4 kg - m$$^2$$ revolving with 16 rad/s is placed on another disc of moment of inertia 8 kg - m$$^2$$ revolving 4 rad/s. The angular frequency of composite disc

4 rad/s

$$\frac{3}{16}$$ rad/s

8 rad/s

$$\frac{16}{3}$$ rad/s

COMEDK 2021

MCQ (Single Correct Answer)

-0

Newton's second law of rotational motion of a system particles having angular momentum L is given by

$${{dp} \over {dt}} = {\tau _{ext}}$$

$${{dL} \over {dt}} = {\tau _{{\mathop{\rm int}} }}$$

$${{dL} \over {dt}} = {\tau _{ext}}$$

$${{dL} \over {dt}} = {\tau _{{\mathop{\rm int}} }} + {\tau _{ext}}$$

COMEDK 2020

MCQ (Single Correct Answer)

-0

Four particles each of the mass m are placed at the corners of a square of side length $$l$$. The radius of gyration of the system about an axis perpendicular to the square and passing through its centre is

$$\frac{l}{\sqrt2}$$

$$\frac{l}{2}$$

$$l$$

$$\sqrt2l$$

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