A cylindrical roller 2.5 m in length, 1.75 m in radus when rolled on a road was found to cover the area of `5500m^2`. How many revolutions did it make?

How many cm^2 are in 1 m^2 ?

The diameter of a roller is 1.4 m and its is 0.7 m long. How much area will it cover in 4 revolutions?

A cylindrical road-roller made of iron is 1 m long. Its internal diameter is 54 cm and the thikcness of the iron sheet used in making the rolleris 9cm. Find the mass of the roller, if 1 cm^3 iron has 7.8 g mass. (Use pi = 3.14)

A cylindrical water tank of diameter 1.4 m and height 2.1 m is being fed by a pipe of diameter 3.5 cm through which water flows at the rate of 2 metre per second. In how many time the tank will be filled?

A tent is in the shape of a cylinder surmounted by a conical top.If the height and diameter of the cylindrical part are 2.1m and 4 m respectively, and the slant height of the top is 2.8 m, find the area of the canvas used for making the tent. Also, find the cost of the canvas of the tent at the rate of Rs 500 per m^2 (Note that the base of the tent will not be covered with canvas.)

A metal rod of length 1 m is rotated about one of its ends in a plane at right angles to a uniform magneic field of 2.5 xx 10^-3 Wb m^-2 . If its makes 30 r.p.s. Calculate the induced e.m.f. between its ends.

The diameter of a roller is 84 cm and its length is 120 cm. It takes 500 complete revolutions to move once over to level a playground. Find the area of the playground in m^2 .