Which of the following has largest M.I _________________.

(a)

Ring about its axis perpendicular to its plane

(b)

Disc about its axis perpendicular to its plane

(c)

Solid sphere

(d)

Bar magnet

A dancer on ice spins faster when she folds her arms. This is due to _________________.

(a)

increase in energy & increase in angular momentum

(b)

increase in K.E & decrease in angular momentum

(c)

increase in K.E & constant in angular momentum

(d)

Decrease in friction at the skates

A bomb traveling in a parabolic path explodes in mid-air. The C.M. of fragments will _______________.

(a)

move vertically downwards

(b)

move irregularly

(c)

move vertically upwards & then downwards

(d)

move in parabolic path the unexploded bomb would have travelled

Consider a system of two identical particles. One is at rest and the other has an acceleration \(\overrightarrow { a } \). The centre of mass has an acceleration ______________.

(a)

1/2\(\overrightarrow { a } \)

(b)

\(\overrightarrow { a } \)

(c)

2\(\overrightarrow { a } \)

(d)

Zero

The least coefficient of friction for an inclined plane inclined at an angle \(\alpha\) with horizontal, in order that a solid cylinder will roll down it without slipping?

(a)

2/3 tan \(\alpha\)

(b)

1/3 tan \(\alpha\)

(c)

2/7 tan \(\alpha\)

(d)

4/3 tan \(\alpha\)