1.

(d) shape of cross section of the wireOne end ofa steel wire of area of cross-section 3 mm- isattached to the ceiling of an elevator moving up with an20.acceleration of 2.2 m/s?. If a load of 8 kg is attached at itsfree end, then the stress developed in the wire will be(a) 8 x 106 N/m2(b) 16 x 106 N/m2e) 20 x 106 N/m32 10 N/m2(d) 32 x 106 N/m2

Answer»

STRESS=FORCE/AREA. As in a escalator accelerating upward, tension in string is T=mg-ma, T=8(10-2.2)=8x7.8.

STRESS=8x7.8/3x10-6. STRESS=20.8x106N/m2.



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