points ncept 1- Ranking rotational kinetic energy Question Starting with the lef

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points ncept 1- Ranking rotational kinetic energy Question Starting with the lef-most column, populate the boxes from left to right without skipping empty boxes. Ties should be grouped in the same box. The following disks are placed at the top of an ineline and released simultaneously. They all have the same mass, radius, and width. Their si to last, the order in which they arrive at the bottom. de profiles are shown below. Rank, from first A. B. C. D. E. References Multipart Answer Concept 1-Ranking rotational kinetic energy

Explanation / Answer

The concept involved here is that of moment of inertia. For same mass and dimensions, the moment of inertia will depend on how the mass is distributed. If we observe the disks, we can see that the mass is not distributed is the same way. Moment of inertia is higher when the mass is distributed far away from the centre. This means that if the mass is closer to the centre, moment of inertia is lower and hence it is easy to rotate the disc (moment of inertia is the resistance of the body towards rotational motion). Hence a disc with lower moment of inertia will reach quickly i.e earlier. Based on the above discussion, the discs in increasing order or moment of inertia are- E,C,A,D,B. Hence the increasing order of time taken to arrive at the bottom is the same- E(reaches first),C,A,D,B(reaches last).

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