A steel cable with a radius `1.5cm` supports a chair lift. If the maximum stress is not to exceed `10^8Nm^-2`, what is the maximum load the cable can support?

We have common experience that a thin thread breaks if pulled at its ends. Also a thin metalic wire, when pulled at the ends elongates and then contracts, when released. A lift is tied with thick iron wires and its mass is 1000kg . What should be the minimum diameter of the wire if the maximum acceleration of the lift is 1.2m/s^2 and maximum safe stress of the wire is 1.4xx10^8N/m^2 (g= 9.8m/s^2 )