Embibe Experts Solutions for Chapter: Rotational Mechanics, Exercise 4: BEGINNER'S BOX - 4

The figure shows a uniform disc, with mass $M=2.4 \mathrm{kg}$ and radius $R=20 \mathrm{cm}$, mounted on a fixed horizontal axle. A block of mass $m=1.2 \mathrm{kg}$ hangs from a massless cord that is wrapped around the rim of the disc. The tension in the cord is:

A thin uniform stick of length $l$ and mass $m$ is held horizontally with its end $B$ hinged on the edge of a table. The point $A$ is suddenly released. The acceleration of the centre of mass of the stick at the time of release is:

If the earth is a point mass of $6\times {10}^{24} \mathrm{kg}$ revolving around the sun at a distance of $1.5\times {10}^8 \mathrm{km}$ and in time, of $T=3.14\times {10}^7 \mathrm{seconds}$, then the angular momentum of the earth around the sun is:

If a particle moves along a straight line whose equation is $y=mx$ then what will be its angular momentum about the origin? Explain your answer.