- #1

palkia

- 52

- 2

## Homework Statement

1) calculate the longest

length of steel wire that can hang vertically without breaking

.breaking stress for steel=7.982*10^8N/m^2 and density of

steel(d)=8.1*10^3kg/m^3.2)A bar of mass m and length l is hanging from a point A as shown in the figure.Find the increase in it's length due to it's own weight.The Young's modulus of eleasticity of the wire is Y and area of cross section of the wire is A.

## Homework Equations

Y=ΔL/L, Stress=F/A

## The Attempt at a Solution

The first questions solves using equation of stress

The second question solves on the basis of strain

I am confused on which formulae to apply... I don't know when to apply which one so can you tell me when to use when and what exactly is the factor deciding to use them.

Can we integrate in the second question for all points in the bar...

[/B]

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