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 balloon is increasing at the rate of 10cm/sec. At what rate is the surface area of the balloon increasing when the radius is 15 cm.

A balloon which always remains spherical has a variable radius. Find the rate at which its volume is increasing with the radius when the latter is 10cm .

A balloon, which always remains spherical has a variable radius. Find the rate at which volume is increasing with the radius when the later is 10 cm.

A spherical bubble is decreasing in volume at the rate of 2cm^3//sec . Find the rate of which the suraface area is diminishing when the radius is 3 cm.

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.

Find rate of change of area of a circle with respect to the time when the radius is increasing at the rate 0.7 cm/s.Given that r=5cm

The radius of a cylinder increases at a rate of 1 cm/s and its height decreases at a rate of 1cm/s. Find the rate of change of its volume when the radius is 5 cm and the height is 15 cm. If the volume should not change even when the radius and height are changed, what is the relation between the radius and height?

A balloon which always remains spherical has a variable diameter 3/2(2 x+1) . Find the rate of change of its volume with respect to x