How many silver coins 1.75 cm in diameter and of thickness 2 mm must be melted to form a cuboid of dimension `5.5 cm xx 10 cm xx 55 cm`.

How many silver coins 1.75 cm in diameter and of thickness 2mm,must be melted to form a cuboid of diamensions 5.5cmxx10cmxx3.5cm ?

How many coins of diameter 1.5 cm and thickness 0.2 cm can be made by melting a right circular metallic solid cylinder of height 10 cm and diameter 4.5cm?

Find how many spherical cartridges of diameter 4.2 cm.each can be made from a solid cuboid of size 66cmxx42cmxx21cm?=58212cm^3

A solid metallic sphere of diameter 21 cm is melted and recast into a number of smaller cones, each of diameter 3.5 cm and height 3 cm. Find the number of cones so formed.

A hole is drilled in a copper sheet. The diameter of the hole is 4.24 cm at 27.0 ^@C . What is the change in the diameter of the hole when the sheet is heated to 227 ^@C ? Coefficient of linear expansion of copper = 1.70 xx 10^-5 K^-1 .

Calculate the energy of a photon of wavelength 6 xx 10^(-5) cm.

Water is flowing at the rate of 15 km/h through a pipe of diameter 14 cm into a rectangular tank whose dimension 55 m xx 44 m . Find the time in which the level of water in the tank will rise by 21 cm.

A metallic sphere of radius 10.5cm is melted and then recast into small cones each of radius 3.5cm and height 3cm.The number of such cone is__-

A pen stand made of wood is in the shape of a cuboid with four concial depressions to hold pens. The dimensions of the cuboid are 15 cm by 10 cm by 3.5 cm. The radius of each of the depressions is 0.5 cm and the depth is 1.4 cm. Find the volume of wood in the entire stand ( see Fig. 13.16).

The diameter of a sphere is 6 cm.It is melted and drawn into a wire of diameter 2 mm.The length of the wire is__