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1
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

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

A
$${{dp} \over {dt}} = {\tau _{ext}}$$
B
$${{dL} \over {dt}} = {\tau _{{\mathop{\rm int}} }}$$
C
$${{dL} \over {dt}} = {\tau _{ext}}$$
D
$${{dL} \over {dt}} = {\tau _{{\mathop{\rm int}} }} + {\tau _{ext}}$$
2
COMEDK 2020
MCQ (Single Correct Answer)
+1
-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

A
$$\frac{l}{\sqrt2}$$
B
$$\frac{l}{2}$$
C
$$l$$
D
$$\sqrt2l$$
3
COMEDK 2020
MCQ (Single Correct Answer)
+1
-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

A
0.15 kg m$$^2$$
B
0.036 kg m$$^2$$
C
0.3 kg m$$^2$$
D
Zero
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