A 55 cm high cylindrical lamp-shade has a small decorative mirrors on its either ends upto a width of 10 cm and 50 mm wire wound around it all over to cover the middle part.How many revolution will the wire take to cover it?

The curved surface of a cylinder is 1000 cm^(2) A wire of diameter 5 mm is wound around it, so as to cover it completely. What is the length of the wire used ?

A cylindrical bottle with radius 5 cm and height 14 cm has jam packed in it. The jam is spread evenly over bread of length 11 cm and breadth 10 cm. How thick can the layer of jam be spread, if the entire jam is to cover 10 bread pieces ?

A brooch is a small piece of jewellery which has a pin at the back so it can be fastened on a dress, blouse or coat.Designs of some brooch are shown below. Observe them carefully. Design A: Brooch A is made with silver wire in the form of a circle with diameter 28mm. The wire used for making 4 diameters which divide the circle into 8 equal parts. Design B: Brooch b is made two colours_ Gold and silver. Outer part is made with Gold. The circumference of silver part is 44mm and the gold part is 3mm wide everywhere. Refer to Design B A boy is playing with brooch B. He makes revolution with it along its edge. How many complete revolutions must it take to cover 80 pi mm ?

A solenoidal coil has 50 turns er cm along its length and a cross-sectional area of 4 cm^2 . 200 truns of another wire is wound round the first solenoid coaxially. The two coils are electrically insulated from each other. Calculate the mutual inductance between the two coils. given that mu_0 = 4 pi xx 10^-7 N A^-2

A copper wire, 3 mm in diameter, is wound about a cylinder whose length is 12 cm , and diameter 10 cm , so as to cover the curved surface of the cylinder. Find the length and mass of the wire, assuming the density of copper to be 8. 88 g p e r\ cm^3

A copper wire, 3 mm in diameter, is wound about a cylinder whose length is 12 cm, and diameter 10 cm, so as to cover the curved surface of the cylinder. Find the length and mass of the wire, assuming the density of copper to be 8. 88g"\ "p e r"\

A copper wire, 3 mm in diameter, is wound about a cylinder whose length is 12 cm, and diameter 10 cm, so as to cover the curved surface of the cylinder. Find the length and mass of the wire, assuming the density of copper to be 8. 88g"\ "p e r"\

A school has 24 display boards in the shape of a rectangle with length 1 m 50 cm and breadth 1 m. How many square meters of cloth is required to cover all the display boards? What will be the length in m of the cloth used, if its breadth is 120 cm?

A cylindrical tank of height 2 m is open at the top and has a radius 50 cm. Water is filled in it upto a height 1.75 m. Calculate how long it will take to empty the tank through a hole of radius 0.05 cm in its bottom.