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Q.

A 900 kg elevator hangs by a steel cable for which the allowable stress is 1.15×108N/m2 . What is the minimum diameter required if the elevator accelerates upward at 1.5m/s2 . Take g= 10  m / s2

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a

6×10−25πm

b

6×10−210πm

c

3×10−210πm

d

3×10−25πm

answer is B.

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Detailed Solution

1.15×108=900(10+a)πd24⇒d=610πcm
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