Question 3 and 4

# Doubt from moment of inertia

Yes thank you

What about question 3

Answer is 31ml^2/12

I’m sorry , i did a mistake there

The distance between the centre of disc and rectangle is 3R/2 and i have written there it as 2R

Please ignore post#5

Can you tell me how you got Mr^2/4 for disc and M(3R/2)^2

Oh sorry I got it please neglect earlier post

In question 5 a part i am getting ml^2/2 which is correct but i am getting b part wrong answer i know that radius of gyration is equal to K=(I/M)^1/2 according to that i am getting k=1/root2 but answer is 1/root6

For radius of gyration’s calculation you have to write I=(Total mass of system) k²

And hence

K=root(I / total mass )

Here instead of total mass=3m you have written it to be m and that’s why you are getting 1/2 instead of 1/6

Oh thanks

I wasn’t able to understand the part b of this question .

What is point P !

If you’ll be able to understand it then do let me know

For part A ,

Is ABCD Aanswer for 2

Yes show your solution

Can you help me how you got M.I as ml^2/4 for 1 and 3 axis ?