Mechanical Prop...

The force required to stretch a steel wire of 1 cm² cross-section to 1.1 times its length would be (Y = 2 × 10¹¹ Nm^–2)

Which one of the following quantities does not have the unit of force per unit area?

A copper wire and a steel wire of the same diameter and length are connected end to end and a force is applied, which stretches their combined length by 1 cm. The two wires will have

Two wires of the same material have lengths in the ratio 1 : 2 and their radii are in the ratio 1∶√2 If they are stretched by applying equal forces, the increase in their lengths will be in the ratio

When a weight of 10 kg is suspended from a copper wire of length 3 metre and diameter 0.4 mm, its length increases by 2.4 cm. If the diameter of the wire is doubled, then the extension in its length will be

A force of 10³ newton stretches the length of a hanging wire by 1 millimetre. The force required to stretch a wire of same material and length but having four times the diameter by 1 millimetre is

On applying a stress of 20 × 10⁸ N/m² the length of a perfectly elastic wire is doubled. Its Young\'s modulus will be

A wire is stretched by 0.01 m by a certain force F. Another wire of same material whose diameter and length are double to the original wire is stretched by the same force. Then its elongation will be

The coefficient of linear expansion of brass and steel are α₁ and α₂. If we take a brass rod of length l₁ and steel rod of length l₂ at 0°C, their difference in length (l₂ – l₁) will remain the same at a temperature if

A rod is fixed between two points at 20°C. The coefficient of linear expansion of material of rod is 1.1 × 10^–5/°C and Young\'s modulus is 1.2 × 10¹¹ N/m². Find the stress developed in the rod if temperature of rod becomes 10°C