Hey there! We receieved your request
Stay Tuned as we are going to contact you within 1 Hour
One of our academic counsellors will contact you within 1 working day.
Click to Chat
1800-5470-145
+91 7353221155
Use Coupon: CART20 and get 20% off on all online Study Material
Complete Your Registration (Step 2 of 2 )
Sit and relax as our customer representative will contact you within 1 business day
OTP to be sent to Change
thanks for the answer of my post(on 3/9/2010).The question was:
MI of a ring is mr^2.
If we treat rings as elements of a disc as well as of a hemisphere,then MI of a disc and of hemisphere should be same (becoz mass as well as perp. distance of every corresponding ring in both from the axis will be same , but actually not. What is wrong in the concept?
(here axis is the axis passing through centre and perp. to plane in both cases)
but if we donot use the concept : MI= ∫ dm.r^2 but simply see the relative positions of rings in disc and hemisphere(as someone has opened the disc to form a hemisphere),then what is wrong in that?
MI(of both)=∑m.r^2 m=mass of every ring = same in both cases
r=perp. distance of every ring from axis=same in both cases.
Dear neeru
In case of hemisphere you can use this concept because mass distribution will not be same throght out its radius.
in case of disk you will get uniform mass distribution through out its area.
but if you will deal hemisphere as a disk then as you move away from the rotation axis then for same dr distance you will get more mass because hemisphere surface become more and more verticle . (mass distribution is not same in this case).
Please feel free to post as many doubts on our discussion forum as you can.If you find any question Difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We are all IITians and here to help you in your IIT JEE preparation.All the best. Regards,Askiitians ExpertsBadiuddin
Get your questions answered by the expert for free
You will get reply from our expert in sometime.
We will notify you when Our expert answers your question. To View your Question
Win Gift vouchers upto Rs 500/-
Register Yourself for a FREE Demo Class by Top IITians & Medical Experts Today !