A small block is rotating in a horizontal circle at the end of a thread which passes down through a hole at the centre of table top. If the system is rotating at 2.5 rps in a circle of 30 cm radius, what will be the speed of rotation when the thread is pulled inwards to decrease the radius to 10 cm ? Neglect friction.

A small block of mass m on a horizontal smooth table is attached to a light string passing through a hole as shown in the figure. Initially, the block moves in a circle of radius r with speed v and the string is held by a person. The person pulls the strin slowly to decrease the radius of circle to r//2 . (a) Find the tension in the string when the block moves in a circle of radius r//2 . (b) Calculate the change in the kinetic energy of the block.

A 0,5 kg mass is rotated in a horizontal circle of radius 20 cm. Calculate the centripetal force acting on it , if its angular speed of rotation is 0.6 rad/s .

In the given figure, TB is a chord which passes through the centre of the circle . PT is a tangent to the circle at the point T on the circle . If PT=10cm , PA=5cm and AB=xcm , then the radius of the circle is :

A small stone of mass 50 g is rotated in a vertical circle of radius 40 cm. What is the minimum tension in the string at the lowest point?

A small stone of mass 50 g is rotated in a vertical circle of radius 40 cm. What is the minimum tension in the string at the lowest point?

In the given figure, TB is a chord which passes through the centre of the circle. PT is a tangent to the circle at the point T on the circle. If PT = 10 cm, PA = 5 cm and AB = x cm. then the radius of the circle is: