![IIT-JEE 2012 Paper 2 Offline Physics - Rotational Motion Question 54 English](https://app-content.cdn.examgoal.net/fly/@width/image/jaoe38c1lzw1awzd/22ee2588-39c5-4f24-9e21-708a289c698b/5db31690-5b6f-11ef-965d-abded2122fc9/file-jaoe38c1lzw1awze.png?format=png)
A metal rod of length L and mass m is pivoted at one end. A thin disk of mass M and radius R ( < L) is attached at its centre to the free end of the rod. Consider two ways the disc is attached : (case A). The disc is not free to rotate about its centre and (case B) the disc is free to rotate about its centre. The rod-disc system performs SHM in vertical plane after being released from the same displaced position. Which of the following statement(s) is(are) true?
A sphere is rolling without slipping on a fixed horizontal plane surface. In the figure below, A is the point of contact, B is the centre of the sphere and C is its topmost point. Then,
If the resultant of all the external forces acting on a system of particles is zero, then from an inertial frame, one can surely say that