Questions
A cotton reel rolls without sliding such that the point P of the string has velocity v = 6 m/s. If r = 10 cm and R = 20 cm, then the velocity of its centre C is
detailed solution
Correct option is C
As cotton reel rolls point of contact of reel with ground will act as instantaneous axis of rotation.vp=ω(R+r)⇒ ω=vpR+r=20rad/sVelocity of centre of reelvC=ωR=vpR(R+r)=6×20(20+10)=4m/sTalk to our academic expert!
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A homogeneous solid cylindrical roller of radius R and mass M is pulled on a cricket pitch by a horizontal force. Assuming rolling without slipping, angular acceleration of the cylinder is
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