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A and B are two steel wires and the radius of A is twice that of B. If they are stretched by the same load, then the stress on B is .....
(a) four times that of A.
(b) two times that of A.
(c) three times that of A.
(d) same as that of A.
A mass of 1 kg is hung from a steel wire if radius 0.5 mm and length 4 m. Calculate the extension produced. What should be the area of cross-section of the wire so that elastic limit is not exceeded? Change in radius is negligible
(Given : g = 9.8 m/s2; Elastic limit of steel is 2.4 x 108 N/m2;Y for steel (Ysteel) = 20 x 1010 N/m2; π = 3.142)