youngs modulus

[cowgiljl]

A truck is pulling a car out of a ditchwith a steel cable that is 9.1 meters long and has a radius of .5cm. When the car just begins to move the tension of the cable is 890N. How much has the cable stretched?
converted .5cm to .005m
area of the wire A = pie*r^2
Y = 20E10 (steel)
used the formula Change in L = F*orginal length/YA

Change in L = 890N*9.10m / 20E10* (pie*.005^2)

and got 5.2E-4 m

did i go about this correctly?

thanks joe

[Doc Al]

Looks OK to me.

[Silverious]

Originally posted by cowgiljl
A truck is pulling a car out of a ditchwith a steel cable that is 9.1 meters long and has a radius of .5cm. When the car just begins to move the tension of the cable is 890N. How much has the cable stretched?
converted .5cm to .005m
area of the wire A = pie*r^2
Y = 20E10 (steel)
used the formula Change in L = F*orginal length/YA

Change in L = 890N*9.10m / 20E10* (pie*.005^2)

and got 5.2E-4 m

did i go about this correctly?

thanks joe

Now, is this cable apple, or cherry pie?

I'm sorry I couldn't resist [:D]