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October 20, 2014

October 20, 2014

Posted by **Liliana** on Wednesday, April 24, 2013 at 2:20pm.

delta y= dy/dx (2pir) * deltax

delta y= 2pi * 10/5280

delta y= 20pi/5280

is this right or no? thanks

- Solved-Calculus-Please check? -
**Reiny**, Wednesday, April 24, 2013 at 6:43pmNo Calculus needed for this

circumference of earth = 2π(radius) = 2πr

radius of earth with string around it = r+10

circumference with string = 2π(r+10)

= 2πr + 20π

so the increase in the length of string

= 20π ft or appr 62.8 ft

notice the data given was not even necessary.

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