Find the radius of the rope that used to lift `10tons(10000kg)`. Elastic limit (maximum stress) of steel is `30xx10^7 N/m^2` .

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 )

Find the height of mountain from the data given below. Maximum shearing stress = 30xx10^7N/m^2 , Density of material of mountain= 3xx10^3kg*m^-3

A steel rod has a radius of 10 mm and a length of 1.0 m.A 100 kN force stretches it along its length. Calculate the elongation of the steel rod. [Young's modulus of steel is 2.0×10^11N/m^2 ]