Mechanical Prop...

If x longitudinal strain is produced in a wire of Young\'s modulus y, then energy stored in the material of the wire per unit volume is

Two wires of equal lengths are made of the same material. Wire A has a diameter that is twice as that of wire B. If identical weights are suspended from the ends of these wires, the increases in length is

Steel and copper wires of same length are stretched by the same weight one after the other. Young\'s modulus of steel and copper are 2 × 10¹¹ N/m² and 1.2 × 10¹¹ N/m². The ratio of increase in length is

A substance breaks down by a stress of 10⁶ N/m². If the density of the material of the wire is 3 × 10³ kg/m³, then the length of the wire of the substance which will break under its own weight when suspended vertically, is

The temperature of a wire of length 1 metre and area of cross-section 1 cm² is increased from 0°C to 100°C. If the rod is not allowed to increase in length, the force required will be (α = 10^–5/°C and Y = 10¹¹ N/m²)

An aluminum rod (Young\'s modulus = 7 × 10⁹ N/m²) has a breaking strain of 0.2%. The minimum cross-sectional area of the rod in order to support a load of 10⁴ Newton\'s is

Two wires of copper having the length in the ratio 4 : 1 and their radii ratio as 1 : 4 are stretched by the same force. The ratio of longitudinal strain in the two will be

A weight of 200 kg is suspended by vertical wire of length 600.5 cm. The area of cross-section of wire is 1 mm². When the load is removed, the wire contracts by 0.5 cm. The Young\'s modulus of the material of wire will be

A steel wire is stretched with a definite load. If the Young\'s modulus of the wire is Y. For decreasing the value of Y

Two identical wires of rubber and iron are stretched by the same weight, then the number of atoms in the iron wire will be