A wire loaded by a weight of density `7.6 g cm^-3` is found to be of length 90 cm. On immersing the weight in water, the length decreased by 0.18 cm. Find the original length of the wire.

In a circle of diameter 40 cm, the length of a chord is 20 cm. Find the length of minor arc of the chord.

The length of a metallic wire is L_1 : when tension on the wie is T_1 , and length is L_2 , when the tension in the wire is T_2 , Find original length of the wire.

The diameter of a copper sphere is 6 cm. It is beaten and drawn into a wire of diameter 0.2 cm. Find the length of wire.

A copper rod of diameter 1 cm and length 8 cm is drawn into a wire of length 18 m of uniform thickness. Find the thickness of the wire.

A solid lead ball of radius 7 cm is melted is converted into a wire of diameter 0.2 cm. find its length of the wire.

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 8.88 g per cm^3 .