InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
Two discs have same mass and thickness. Their materials are of densities `pi_(1)` and `pi_(2)`. The ratio of their moment of inertia about central axis will beA. `1:rho_(1)rho_(2)`B. `rho_(1)rho_(2):1`C. `rho_(1):rho_(2)`D. `rho_(2):rho_(1)` |
|
Answer» Correct Answer - D Moment of inertia of disc, `I=(1)/(2)MR^(2)=(1)/(2)M((M)/(pi rhot))` `(because rho=(M)/(V)=(M)/(piR^(2)t):. R^(2)=(M)/(pi rhot))` `I = (1)/(2) (M^(2))/(pi rho t)` `:. I prop (1)/(rho)` (As M and t are constant) `(I_(1))/(I_(2))=(rho_(2))/(rho_(1))`. |
|