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Use Hooke's Law to determine the variable force in the spring problem. A force of 5 inches compresses a 15-inch spring a total of 3 inches. How...

Hooke's law states that a force is needed to stretch or compress a spring by a distance of x. The force is proportional to the distance x. is written as `F = kx`


where:


 F  = force


k = proportionality constant or spring constant


 x= length displacement from its natural length


Applying the given variable force: `F= 5`  to compress a `15` -inch spring a total of `3` inches, we get:


`F=kx`


`5=k*3`


`k=5/3`


Plug-in `k =5/3` on Hooke's law, we get:


`F = (5/3)x`


Works is done when a force is applied to move an object to a new position, It can be defined with formula: `W = F*Deltax `  where:


 `F` = force or ability to do work.


`Deltax` = displacement as 


With  variable force function: `F (x)= (5/3)x ` , we set-up the integral application for work as:


`W = int_a^b F(x) dx`


`W = int_0^7 (5/3)xdx`


Apply basic integration property: `int c*f(x)dx= c int f(x)dx.`


`W = (5/3)int_0^7 xdx`



Apply Power rule for integration: `int x^n(dx) = x^(n+1)/(n+1).`


`W = (5/3) * x^(1+1)/(1+1)|_0^7`


`W = (5/3) * x^2/2|_0^7`


`W = (5x^2)/6|_0^7`


Apply definite integral formula: `F(x)|_a^b = F(b)-F(a)` .


`W = (5(7)^2)/6 -(5(0)^2)/6`


`W =245/6 - 0`


`W=245/6` or `40.83 ` inch-lbs

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