Question

For this problem, you need to make up your own problem relating to angular momentum (you can use whichever form/definition of angular momentum you like). The problem should describe a real-world situation (in class, we did the problem of an instructor holding a couple of weights and spinning around on a stool, for example). Solve your problem, providing a numerical answer.​

(note: sorry for asking to make up a question, I hardly understand angular momentum as is and do not think I could properly write a problem for something I do not fully grasp yet, thank you.)

Answer 1

Problem: A disk with radius 2m and moment of inertia 50 kg.m^2 is rotataing with angular speed 30 rad/s,

if a body with mass 1 kg sticks at the outer edge of the disk what is the final angular speed of the disk and mass system?

Solution :
Apply conservation of momentum

final angular momentum = initial angular momentum

If*wf = Ii*wi

(50 + m*R^2)*wf = 50*30

(50 + 1*2^2)*wf = 1500

wf = 1500/(50 + 4)

= 27.8 rad/s <<<<<<<<------------------Answer