Most Important Selected Qs for JEE AdvancedPhysicsRotational Motion
A disc of radius R is rolling without slipping with an angular acceleration , on a horizontal plane. Four points are marked at the end of horizontal and vertical diameter of a circle of radius r( R) on the disc. If horizontal and vertical direction are chosen as x and y axis as shown in the figure, then acceleration of points 1,2,3 and 4 are a ₁, a ₂, a ₃ and a ₄ respectively, at the moment when angular velocity of t
Options
- A(A) - (Q), (B) - (R), (C) - (P), (D) - (S)
- B(A) - (R), (B) - (Q), (C) - (S), (D) - (P)
- C(A) - (Q), (B) - (P), (C) - (R), (D) - (S)
- D(A) - (S), (B) - (R), (C) - (Q), (D) - (P)
Correct answer
A. (A) - (Q), (B) - (R), (C) - (P), (D) - (S)
Step-by-step solution
For ( A ) : Acceleration of 1 w.r.t. centre of mass =r i - ^2 r j a ₁=r i - ^2 r j +R i =(R+r) i - ^2 r j For ( B ): a ₂=-r j - ^2 r i +R i = (R - ^2 r ) i -r j For ( C ): a ₃=-r i + ^2 r j +R i =(R -r ) i + ^2 r j For ( D ): a ₄=r j + ^2 r i +R i = (R + ^2 r ) i +r j