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

The volume of a spherical balloon is increasing at the rate of 20 cm^3/sec . Find the rate at which its surface area is increasing at the instant when its radius is 4 cm.

In a competition, a brave child tries to inflate a huge spherical balloon bearing slogans against child labour at the rate of 900 cubic centimeter of gas per second. Find the rate at which the radius of the balloon is increasing when its radius is 15 cm. Also write any three value/life skill reflected in this question.

The radius of spherical balloon is increasing at the rate 5 cm per second. At what rate is the surface of the balloon increasing, when the radius is 10 cm?

A spherical balloon grows to twice its radius when inflated. How has its volume increased ?

The radius of a coil s changing at the rate of 10^-2 units in a normal magnetic field of 10^-3 units and the induced e.m.f. is 1muV . Find the final radius of the coil.

The radius of a right circular cylinder increases at a constant rate. Its altitude is a linear function of the radius and increases three times as fast as the radius when the radius is 1 cm and the altitude is 6\ cm . When the radius is 6 cm , the volume is increasing at the rate of 1\ cm^(3)//s . When the radius is 36 cm , the volume is increasing at a rate of n\ cm^(3)//s . What is the value of n ?

Find the rate of the change of surface area of a sphere when its radius is increasing at the rate of 3/pi cm/min and its radius is 1 cm.