Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
Concepts Of Physics MCQ Edition [Volume 1]PhysicsRotational Mechanics

A kid of mass M stands at the edge of a platform of radius R which can rotate freely about its axis. The moment of inertia of the platform is I . The system is rotating anticlockwise with angular speed while the kid stands on the rim. The kid then walks along the rim in the anticlockwise direction with speed v relative to the platform. Find the new angular speed of the platform.

Options

  1. A- MvR I + MR^2
  2. B+ MvR I + MR^2
  3. C- MvR I
  4. D- Mv I + MR^2

Correct answer

A. - MvR I + MR^2

Step-by-step solution

- MvR I + MR^2

Practice Rotational Mechanics on Quantrex Academy →

More from Rotational Mechanics

A wheel revolves about its axis with a uniform angular acceleration. Beginning from rest, it attains 100 rev/sec in 4 seconds. Determine the angular acceleration and the angle rotaStarting from rest, a wheel is uniformly accelerated at 4 rad/s ^2 for 10 seconds. Subsequently, it rotates uniformly for the next 10 seconds, and is finally brought to rest over tDetermine the angular velocity of a body rotating with an acceleration of 2 rev/s ^2 as it completes the 5 th revolution after starting.A body rotates about a fixed axis with an angular acceleration of one radian/second/second . Determine the angle through which it rotates during the time in which its angular velocA disc of radius 10 cm rotates about its axis with an angular speed of 20 rad/s . Determine the linear speed of a point situated on the rim.A disc of radius 10 cm rotates about its axis with an angular speed of 20 rad/s . Determine the linear speed of the middle point of a radius.A disc rotates about its axis with a uniform angular acceleration of 4 rad/s ^2 . Determine the radial and tangential accelerations of a particle located 1 cm from the axis at the A block is suspended from a string wrapped on a disc of radius 20 cm , which is free to rotate about its fixed horizontal axis. If the angular speed of the disc is 10 rad/s at a pa Full Rotational Mechanics list All Concepts Of Physics MCQ Edition [Volume 1] PYQs