Mechanical Prop...

An area of cross-section of rubber string is 2 cm². Its length is doubled when stretched with a linear force of 2 × 10⁵ dynes. The Young\'s modulus of the rubber in dyne/cm² will be

The temperature of a wire of length 1 m² and area of cross-section 1 cm is increased from 0°C to 100°C. If the rod is not allowed to increase in length, the force required will be (a = 10^–5/°C and Y = 10¹¹ wm²)

If longitudinal strain for a wire is 0.03 and its Poisson\'s ratio is 0.5, then its lateral strain is

An aluminium 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 wire elongates by 1 mm when a load W is hanged from it. If the wire goes over a pulley and two weights W each are hung at the two ends, the elongation of the wire will be (in mm)

The ratio of diameters of two wires of same material is n : 1. The length of wires are 4 m each. One applying the same load, the increase in length of thin wire will be

Longitudinal stress of 1 N/mm² is applied on a wire. The percentage increase in length is (Y = 10¹¹ wm²)

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