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  • One end of the steel wire eof area of cross section  is attached to the ceiling of an elevator moving with an acceleration of 2.2 <

One end of the steel wire eof area of cross section 3 mm^2 is attached to the ceiling of an elevator moving with an acceleration of 2.2 m/s^2. If a load of 8 kg is attached at its free end, then the stress (in N/m2) developed in the wire will be 

Option: 1

8 x 106


Option: 2

16 x 106


Option: 3

20 x 106


Option: 4

32000000


Answers (1)

best_answer

T = m (g+a)

 = 8 (9.8+2.2)

= 96 N 

Stress = T/A = \frac{96 }{3 \times 10 ^{-6}} = 32 \times 10 ^6 N/m^2

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