a metal wire 3.50m long and 0.70mm in diameter was given the following test. a load weight 20N was originally hung from the wire to keep it taut. the position of the lower end of the wire was read on a scale as loads was added. determine young's modulus​

Answers

Answer 1

Answer:

Young-modulus=3.7*10^8N/m^2

Explanation:

We are not given the read position on the scale as this value represent the new length, which is needed to compute the change in length "e"

However, let us use a value of 4m to represent the value on the scale

Step one:

given data

original length=3.5m

diameter d= 0.7mm in meters= 7*10^-4m

Area A= πd^2/4

A= 3.142* (7*10^-4)^2/4

A=3.142*4.9*10^-7/4

A=  3.85×10-7m^2

Force F= 20N.

original length =3.5m

change in length = 4-3.5= 0.5m

Step two:

[tex]young-modulus= \frac{stress}{strain}[/tex]

[tex]stress= \frac{F}{A}[/tex]

[tex]strain= \frac{l}{L}[/tex]

l= change in length = 4-3.5= 0.5m

L= original length =3.5m

solving for the stress

[tex]stress= \frac{20}{3.85*10^-^7}\\\\stress= 5.19*10^7[/tex]

stress= 5.19*10^7N/m^2

solving for strain

[tex]strain= \frac{0.5}{3.5}\\strain= 0.14[/tex]

[tex]Young-modulus= \frac{5.19*10^7}{0.14}\\\\ Young-modulus=3.7*10^8[/tex]

Young-modulus=3.7*10^8N/m^2


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