# Question on Equation Rearranging

1. Jan 25, 2006

### nicole

Hi everybody. Sorry for urgency, but I am in dire need of help for my physics lab exam. Has anyone ever had experience with the formula:

T^2 = kd + A/d

From a graph of T^2d (yaxis) vs. d^2 (xaxis), we can get the slope and the y intercept.

We are supposed to find the values of the constants k and A. Any ideas?

SO FAR...
we have the idea that from the graph we can get an equation of y=mx+b and use that to find the values of k and A. So, the b value would be (A/d) and the mx (kd). Does this work? Any ideas. THANK YOU SO MUCH IN ADVANCE

2. Jan 25, 2006

### Robine

If this is T x T = kd + A/d with k,A constants and T, d variables it's a non linear equation, NOT a straight line.

3. Jan 25, 2006

### vanesch

Staff Emeritus
Yes, but they were plottin (T^2 d) as a function of d^2. Now, THAT is then of course equal to T^2 d = k d^2 + A = m d^2 + b.

So the suggestion is obviously correct, but I wonder how the OP cannot see this him/her self...