1
COMEDK 2024 Evening Shift
+1
-0

Joule second is the unit of

A
Energy
B
Power
C
Angular momentum
D
Linear momentum
2
COMEDK 2024 Morning Shift
+1
-0

A body of mass $$5 \mathrm{~kg}$$ at rest is rotated for $$25 \mathrm{~s}$$ with a constant moment of force $$10 \mathrm{~Nm}$$. Find the work done if the moment of inertia of the body is $$5 \mathrm{~kg} \mathrm{~m}^2$$.

A
625 J
B
125 J
C
6250 J
D
1250 J
3
COMEDK 2023 Morning Shift
+1
-0

A thin circular ring of mass ,$$M$$ and radius $$R$$ rotates about an axis through its centre and perpendicular to its plane, with a constant angular velocity $$\omega$$. Four small spheres each of mass $$m$$ (negligible radius) are kept gently to the opposite ends of two mutually perpendicular diameters of the ring. The new angular velocity of the ring will be

A
$$\left(\frac{M+4 m}{M}\right) \omega$$
B
$$\frac{M}{4 m} \omega$$
C
$$\left(\frac{M}{M+4 m}\right) \omega$$
D
$$\left(\frac{M}{M-4 m}\right) \omega$$
4
COMEDK 2023 Evening Shift
+1
-0

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?

A
4 N m
B
3.2 N m
C
2 N m
D
3.4 N m
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