The volume of spherical ballon being inflated at a constant rate. If initially its radius is 3 units and after 3 seconds it is 6 units. Find the radius of the balloon after t seconds.

If the volume of a sphere is increasing at a constant rate, then the rate at which its radius is increasing is a)a constant b)proportional to the radius c)inversely proportional to the radius d)inversely proportional to its surface area

Consider the circle x^2+y^2-4x-6y-3 = 0 Find the radius of the circle

Suppose that a spherical balloon is inflated and it has volume 'v' and radius 'r' at time 't'. If the balloon is inflated by pumping 900c.c. of gas per second. Find the rate at which the radius of the balloon is increasing when the radious is 15 cm.

The radius of a solid sphere is 6 centimetres. Find its volume and surface area.

The radius of two spherical tanks are in the ratio '3: 4'. The volume of the first tank is 540 litres. Find the volume of the second tank.

A spherical rain drop evaporates at a rate proportional to its surface area. If its radius is originally 3 mm and after 1 hour i t is reduced to 2 mm, find an expression for radius of rain drop at any time.

The radius of a cylinder is increasing at the rate of 5 cm/min so that its volume is constant. When its radius is 5 cm and height is 3 cm, then the rate of decreasing of its height is a)6 cm/min b)3 cm/min c)2cm/min d)5 cm/min