A steel wire of length 4.7 m and cross-sectional area `3.0 xx 10^- 5 m^2` stretches by the same amount as a copper wire of length 3.5 m and cross-sectional area of` 4.0 xx 10^-5 m^2` under a given load. What is the ratio of the Young’s modulus of steel to that of copper?

A wire length L and cross sectional area A is made of material of Young's modulus Y . It is strectched by an amount X . The work done is

A elongation of 0.1% in a wire of cross-sectional area 10"6 m2 causes tension 100 N. The young’s modulus is

A steel wire 4 m in length and 2.4*10^(-7)m^2 in cross - section is stretched by a force of 36N . Calculate the stress and strain .

Find the resistance of a silver wire of length 5m and area of cross-section 4mm^2 . Resistivity of a silver is 1.6xx10_-8 Omega m.

A 14.5 kg mass, fastened to the end of a steel wire of unstretched length 1.0 m, is whirled in a vertical circle with an angular velocity of 2 rev/s at the bottom of the circle. The cross-sectional area of the wire is 0.065 cm^2 . Calculate the elongation of the wire when the mass is at the lowest point of its path.

A radio signal has wave length 300 m and speed 3 xx 10^8 m//s . Find out the frequency of the signal.

Calculate the amount of work done for a wire which area of cross section 10^-6m^2 and length 1.5m to increase the length 4 xx 10^-3 m. Young's modules of elasticity 2 xx 10^(11N//m^2) .