Astudent sits at rest on a piano stool that can rotate without friction. the moment of inertia of the student-stool system is 4.5 kg⋅m2 . a second student tosses a 2.0 kg mass with a speed of 2.5 m/s to the student on the stool, who catches it at a distance of 0.35 m from the axis of rotation. what is the resulting angular speed of the student and the stool?

Here We can use principle of angular momentum conservation

Here as we know boy + projected mass system has no external torque

Since there is no torque so we can say the angular momentum is conserved

now we know that

m = 2 kg

v = 2.5 m/s

L = 0.35 m

I = 4.5 kg-m^2

now plug in all values in above equation

so the final angular speed will be 0.37 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