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7. System of Particles and Rotational Motion
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Q4 of 28 Page 50

When a disc rotates with uniform angular velocity, which of the following is not true?

As disc is rotating with uniform angular velocity, ω is constant.

Therefore


Angular acceleration


(Differentiation of constant is 0)


= 0


So, its angular acceleration is zero.


Hence, option d is correct answer.

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2

Which of the following points is the likely position of the centre of mass of the system shown in Fig. 7.1?


3

A particle of mass m is moving in yz-plane with a uniform velocity v with its trajectory running parallel to +ve y-axis and intersecting z-axis at z = a (Fig. 7.2). The change in its angular momentum about the origin as it bounces elastically from a wall at y = constant is:


5

A uniform square plate has a small piece Q of an irregular shape removed and glued to the centre of the plate leaving a hole behind (Fig. 7.3). The moment of inertia about the z-axis is then


6

In problem 7.5, the CM of the plate is now in the following quadrant of x-y plane,

Questions · 28
7. System of Particles and Rotational Motion
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