A small metallic washer is of 7 mm radius with a hole of 3.5 mm radius.What is the area of the washer?

A water tank has a hole at a distance of 7 m from free water surface. Find the velocity of water through the hole. If the radius of the hole is 2 mm what is the rate of flow of water?

If a solid large sphere is made by melting three small gold-sphere of radii 3 mm , 4mm, and 5mm, then what will be the radius of the large sphere?

An egg of a particular bird is very nearly spherical. If the radius to the inside of the shell is 5mm and radius to the outside of the shell is 5.3 mm, find the volume of the shell approximately.

A circular metal plate is heated so that its radius increases at a rate of 0.1 mm per minute. Then the rate at which the plate's area is increasing when the radius is 50 cm, is

If a metallic circular plate of radius 50 cm is heated s that its radius increases at the rate of 1 mm per hour, then the rate at which, the area of the plate increases ("in" cm^(2)// "hour") is

A circular metal plate is heated so that its radius increases at a rate of 0.1 mm per minute. Then the rate at which the plate's area is increasing when the radius is 50 cm, is

In the given figure, a cylindrical wrapper of flat tablets is shown. The radius of a tablet is 7 mm and its thickness is 5 mm. How many such tablets are warpped in the wrapper?

A steel ball of 50mm radius is kept on a hole of concrete. The diameter of the hole is 0.05mm less then the diameter of the steel ball at 20^(@)C . Coefficient of volume expansion of the steel ball is 3.2x 10^(-6)//^(@)C . At what temperature the ball will be inside the hole ?

A square is drawn such that its vertices are lying on a circle of radius 201 mm. What is the ratio of area of circle to that of square ?

A solid metallic cylinder of radius 3.5 cm and height 14 cm is melted and recast into a number of small solid metallic balls, each of radius (7)/(12) cm. Find the number of balls so formed.