A particle is moving in a circle

Mass $M$ hangs by a massless rod of length $l$ which rotates at a constant angular frequency $\omega$ as shown in the figure. The mass moves at a steady speed in a circular path of constant radius $r$. $\alpha$ is the angle that string makes with the vertical. Which of the following graph is correct.

A ball of mass $m$ is attached to the end of a thread fastened to the top of a vertical rod which is fitted to a horizontally revolving round table as shown. If the thread forms an angle $\alpha$ with the vertical, the angular velocity $\omega$ of table is

Two very small balls $A$ and $B$ of masses $4.0 \mathrm{kg}$ and $5.0 \mathrm{kg}$ are affixed to the ends of a light inextensible cord that passes though a frictionless ring of radius negligible compared to the length of the cord. The ring is fixed at some height above the ground. Ball $A$ is pulled aside and given a horizontal velocity so that it starts moving on a circular path parallel to the ground, keeping ball $B$ in equilibrium as shown.

Speed of the ball $A$ is closest to