A rod $OA$ of mass $4kg$ is held in horizontal position by a massless string $AB$ as shown in figure. Length of the rod is $2m$. Find
(a) tension in the string.
(b) net force exerted by hinge on the rod. $(g=10m/s^2)$.

Q. A rod OA of mass $4kg$ is held in horizontal position by a massless string AB as shown in figure. Length of the rod is $2m$. Find net force exerted by hinge on the rod. (g= $10m/s^2$)

Q. A rod OA of mass $4kg$ is held in horizontal position by a massless string AB as shown in figure. Length of the rod is $2m$. Find tension in the string.

Q. A uniform rod $AB$ of mass $2kg$ is hinged at one end $A$. The rod is kept in the horizontal position by a massless string tied at point $B$. Find the reaction of the hinge (in N) on end $A$ of the rod at the instant when string is cut. $(g=10m/s^2)$

Q. Uniform rod $AB$ is hinged at the end $A$ in a horizontal position as shown in the figure (the hinge is frictionless, that is, it does not exert any friction force on the rod). The other end of the rod is connected to a block through a massless string as shown. The pulley is smooth and massless. Masses of the block and the rod are same and are equal to ${}^{\prime }{m}^{\prime }$. Acceleration due to gravity is $g$. The tension in the thread, and angular acceleration of the rod just after the release of the block from this position:

Q. Uniform rod $AB$ of mass $3\text{kg}$ and length $2\text{m}$ is hinged at end $A$ in horizontal position as shown in the figure. The other end is connected to a block of mass $1\text{kg}$ through a massless string. The pulley is smooth and massless. Find the angular acceleration of the rod about the hinge just after release. (Take anti-clockwise rotation positive)