Hi fi you look at quesiotn 16b in the following link they try to find dE/dx.(adsbygoogle = window.adsbygoogle || []).push({});

they use the chain rule. the chain rule says dF/dt=dx/dt*dF/dx+dy/dt*dF/dy if F=f(x,y) and x=f(t) and y=f(t).

But in 16b they're trying to find dE/dx and as part of the use of the chain rule they try to find dt'/dx (in the first equation under where it says 'a galilean transform...') however t' is not a function of x, so i don't understand why they're taking the derivative of t' wrt to x.

http://stuff.mit.edu/afs/athena/course/8/8.20/www/sols/sol1.pdf

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Chain rule

**Physics Forums | Science Articles, Homework Help, Discussion**