Adisc of moment of inertia 1.8 k g. m2 is rotating at a constant angular velocity of 3.2 rad. s−1. a second disc of moment of inertia 0.6 kg. m2, initailly at rest, falls on the first disc and the two rotate as a system. what is the angular velocity of the system?

2.4 rad/s

Explanation:

= Initial angular velocity = 3.2 rad/s

= Final angular velocity of the system

= Initial angular momentum = 1.8 kgm²

= Final angular momentum = 0.6 kgm²

As there is no external torque then the angular momentum in the system is conserved

The angular velocity of the system is 2.4 rad/s

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

at right angles to each other