- #1
Eismcsquared
- 3
- 0
Hello all.
I was playing around with the time dilation equation : √(1-v2/c2)
Specifically, I decided to take the derivative(d/dv) of the equation. Following the rules of calculus, as little of them as I know, I got this:
d/dv(√(1-v2/c2) = v / (c2√(1-v2/c2)).
Now, this seems reasonable enough, and when I (don’t hate me for this) plugged in our original equation into Desmos, and asked for the derivative as well, my equation seemed to be correct.
However, every time I attempt to produce the second derivative of the equation, I end up with an output of simply -1. Naturally this is wrong, and desmos agrees.
Here’s my work:
-v • d/dv(1/√(1-v2/c2))•d/dv(-v)•1/√(1-v2/c2)
Continuing...
-v•1/(-v / c2√(1-v2/c2))
• 1/c2√(1-b2/c2) • -1
Simplifying...
-v•c2√(1-v2/c2)/(-v)
• -1/(c2√(1-v2/c2)
Simplifying some more, i get -1??
I have no clue where I’m going wrong.. I think it’s simply a matter of me not quite understanding one the calculus rules I used in this.
I’m sorry for any formatting errors/messiness but I’ll try to clean it up as best I can. I can’t seem to find the fraction button.
I was playing around with the time dilation equation : √(1-v2/c2)
Specifically, I decided to take the derivative(d/dv) of the equation. Following the rules of calculus, as little of them as I know, I got this:
d/dv(√(1-v2/c2) = v / (c2√(1-v2/c2)).
Now, this seems reasonable enough, and when I (don’t hate me for this) plugged in our original equation into Desmos, and asked for the derivative as well, my equation seemed to be correct.
However, every time I attempt to produce the second derivative of the equation, I end up with an output of simply -1. Naturally this is wrong, and desmos agrees.
Here’s my work:
-v • d/dv(1/√(1-v2/c2))•d/dv(-v)•1/√(1-v2/c2)
Continuing...
-v•1/(-v / c2√(1-v2/c2))
• 1/c2√(1-b2/c2) • -1
Simplifying...
-v•c2√(1-v2/c2)/(-v)
• -1/(c2√(1-v2/c2)
Simplifying some more, i get -1??
I have no clue where I’m going wrong.. I think it’s simply a matter of me not quite understanding one the calculus rules I used in this.
I’m sorry for any formatting errors/messiness but I’ll try to clean it up as best I can. I can’t seem to find the fraction button.