The correct option is A
6×10−2√10π M
Calculate tension for elevator
Given, mass of the lift, M=900 kg
Acceleration of the lift, a=1.5 m/s2
T=M(g+a)
T=9000(10+1.2)
=900(11.2) N
Calculate diameter required by elevator
Formula used: stress =TA
Given, stress in the cable =1.15×108 N/M2
Let the diameter of the cable be d. Therefore,
stress =TA
1.15×108=900(11.2)(πd24)
⇒d=6×10−2√10π m