Highly selective Backlog Qs for JEE MainPhysicsRotational Motion
If the Earth were to suddenly contract to ( 1 n ) th of its present radius without any change in its mass, the duration of the new day will be nearly
Options
- A(24 / n hr ).
- B(24 n hr ).
- C(24 / n ^2 hr ).
- D(24 n^2 h r ).
Correct answer
C. (24 / n ^2 hr ).
Step-by-step solution
Hints: ( I ₁ ₁= I ₂ ₂ ) ( aligned & 2 5 MR ^2 ( 2 T ₁ )= 2 5 M R ^2 n ^2 ( 2 T ₂ ) & T ₂= T ₁ n ^2 = 24 n ^2 aligned )