COMEDK 2022 | Rotational Motion Question 3 | Physics

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

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

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

$$l$$

$$\sqrt2l$$

COMEDK 2020

MCQ (Single Correct Answer)

-0

The masses of 200 g and 300 g are attached to the 20 cm and 70 cm marks of a light meter rod, respectively. The moment of inertia of the system about an axis passing through 50 cm mark is

0.15 kg m$$^2$$

0.036 kg m$$^2$$

0.3 kg m$$^2$$

Zero

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