Question

A 1000 kh lift is yied with metaalic wire of amximium safe stress of 1.4 10^8n/m^2 if the maximum accleration of the lift is

Answer 1

Answer:

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tension in wire = T= 1000 (9.8 + 1.2) = 11000N

maximum stress = T/ λr min² = 110000 x 7 /22 x r min²

r min² = 50²/ (10⁴)²

minimum radius = 50 x 10⁻⁴

minimum diameter= 2 x rmin

= 2 x 50 x 10⁻⁴

= 100 x 10⁻⁴m

= 0.01m