For which of the following does the centre of mass lie outside the body?

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

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:

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

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