# physics

posted by
**Edwin**
.

A light rigid bar is suspended horizontally from two vertical wires, one of steel and one of brass. Each wire is 2.00m long. The diameter of the steel wire is 0.60mm and the length of the bar AB is 0.20m. When a mass of 10.0kg is suspended from the centre of AB the bar remains horizontal. (i)what is the tension in each wire? (ii)calculate the extension of the steel wire and the energy stored in it. (iii)calculate the diameter of the brass wire. (iv)if the brass wire were replaced by another brass wire of diameter 1.00mm, where should the mass be suspended so that AB would remain horizontal? The young modulus for steel= 2.0 x 10^11 Pa, the young modulus for brass=1.0 x 10^11 Pa.