Question

Two uniform circular discs having the same mass and same thickness are made from different materials.The disc with smaller Moment of inertia is:
A)The one made from more dense material

B)The one made from less dense material

C)Neither,Both have same MOI

D)The disc with larger angular velocity

Answer 1

@RnR

Answer 2

So jaa ab. :/

Answer 3

:/ bata dena :| bahut purana doubt ha.

Answer 4

I dont think it depends on thickness?

Answer 5

it does,VERY VERY VERY indirectly.

Answer 6

Hmm. I dont know.

Answer 7

I=MR^2
I=Volume x Density x R^2
I=Area x Thickness x Density x R^2!!!

Answer 8

Galat hai. Same material? Same area?

Answer 9

I=MR^2
M same for both,so only depends on radius?i guess

Answer 10

Yup. I think so.

Answer 11

kiska hoga +?

Answer 12

Pta nhi yr. Dimaag ki dahi ho chuki hai. :/

Answer 13

:/

Answer 14

@Mashy

Answer 15

@Mashy Sir?

Answer 16

T h i s n i g h t i s s p a r k l i n g
Don't you let it go. .
I'm wonder stuck ..
blushing all the way home...
I'll spend f o re v er wondering if you knew..
I was enchanted to meet you oooo..:")

Answer 17

LOL

Answer 18

wait lemme htnk!

Answer 19

htnk

Answer 20

ok.. since they have to be equally thick and of same mass.. you can imagine one having a large radius (disc a) and one more have small radius (disc b)..

definitely the one with larger radius has the higher moment of inertia.. now think which one is more dense :P

Answer 21

I didnt read it, but there you go with the medal. :P

Answer 22

why imagine with different radius?

Answer 23

lol you do know its very rare that i get it right the first time :P

and DLS when you consider a general case you should always consider them having adifferent parameters!

Answer 24

Will density have any affect at all?

Answer 25

Density increases
Area Decreases
Radius Decreases
Inertia decreases

Answer 26

What do you mean by adjacent parameters?

Answer 27

Density increases
MOI decreases

Answer 28

what are you blabbering DLS??

i mean alwys consider the two objects to have different parameters of their characteristics..


since they have same mass and same thickness.. the only thing they can now have different is radius..

Answer 29

in my earlier post.. disc a is the answer...so now find out whether disc a has bigger density or smaller density!

Answer 30

Density increases
Area Decreases
Radius Decreases
Inertia decreases

Answer 31

So A)

Answer 32

IN MY POST

DISC A HAS HIGHER RADIUS and Same mass as Disc b which has smaller radius and same mass

they have same thicknes.. so which one has more density!?!?? a or b??

Answer 33

But why is..
\[\LARGE Density =\frac{k}{Area}?\]

Answer 34

think logically man.. and tell me which has higher density ? the one with bigger radius or smaller radius? :-/

Answer 35

smaller

Answer 36

obviously right.. the smaller radius has bigger density..
and the bigger radius has smaller density.. and this one which has higher moment of inertia..
so the answer is the one with smaller density!