A 4 m long steel wire having 40 mm in diameter, a Young`s modulus of 20 × 〖10〗^10 N/m^2 and an elastic limit of 2.5 × 〖10〗^8 N/m^2 is used to support a weight of 100 KN .
a) By how much does the wire stretch under this load ?
b) what is the maximum weight the steel wire is able to support without being permanently deformed?
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