TomLikesPhysics
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Questions Asked

TomLikesPhysics:
Group Title
The element K decays into Ar and Ca (via beta plus/minus decay). At t=0 you got from element K N times and zero from Ar and Ca. Ar and Ca ha…
 updated one month ago
 4 replies
 No Medals Yet
Mathematics

TomLikesPhysics:
Group Title
In TD one can write dU=TdS while V and N do not change.
This sounds like adding a little bit of entropy "dS" in the system to increase the …
 updated 2 months ago
 1 reply
 1 Medal
Mathematics

TomLikesPhysics:
Group Title
How do I check that I rotated a vector 180° around some axis (like y).
I start with (x,y,z) and after a 180° rotation around the yaxis I g…
 updated 3 months ago
 14 replies
 3 Medals
Mathematics

TomLikesPhysics:
Group Title
I am looking for a proof that i times the partial derivative of x is a hermitian operator. Here is what I found but I don´t know why the min…
 updated one year ago
 1 reply
 No Medals Yet
Mathematics

TomLikesPhysics:
Group Title
How do I prove that Psi (the orange angle) is 90°. I know or can calculate all the blue angles I marked but I don´t know what equation I nee…
 updated one year ago
 28 replies
 2 Medals
Mathematics

TomLikesPhysics:
Group Title
How do I calculate the full width half maximum of a rectangle function. I guess it should be zero or one period but I am not sure.
 updated one year ago
 2 replies
 No Medals Yet
Mathematics

TomLikesPhysics:
Group Title
How do I tackle an integral like e^(i*w*tt^2/T^2) from infinity to infinity. This thing is supposed to be an fourier integral. I tried sol…
 updated one year ago
 8 replies
 2 Medals
Mathematics

TomLikesPhysics:
Group Title
I need to show that the ln of the absolute value of x (a 2d vector) is a harmonic function which means that the laplace operator of that fu…
 updated one year ago
 2 replies
 No Medals Yet
Mathematics

TomLikesPhysics:
Group Title
I have to vectors and know that they are not linearly independent. Does this also mean that they are parallel?
By vector I don´t necessaril…
 updated one year ago
 5 replies
 1 Medal
Mathematics

TomLikesPhysics:
Group Title
If one uses spherical geometry the angels in a triangle are bigger than 180° or pi.
This results form a violation of an axiom (from euclid)…
 updated one year ago
 6 replies
 1 Medal
Mathematics

TomLikesPhysics:
Group Title
On sunday I was playing billard and could not help but wonder why on earth the white ball never completely stopped when I hit some other bal…
 updated one year ago
 No Medals Yet
Mathematics

TomLikesPhysics:
Group Title
I need help/advice with an diracdelta integral. I computed the integral seen in the attachment and got 1. However, I am not quite sure if I…
 updated 2 years ago
 14 replies
 1 Medal
Mathematics

TomLikesPhysics:
Group Title
I need help with an implicit function.
 updated 2 years ago
 7 replies
 1 Medal
Mathematics

TomLikesPhysics:
Group Title
A rod with length l and mass m is standing at first perpendicular on a frictionless table, then he begins to fall.
What is the velocity of …
 updated 2 years ago
 8 replies
 1 Medal
Mathematics

TomLikesPhysics:
Group Title
I need help with a matrix / Gauß.
 updated 2 years ago
 14 replies
 1 Medal
Mathematics

TomLikesPhysics:
Group Title
I am supposed to take a hard look at this network, come up with a matrix and use it to get all the currents. Can someone help me to setup th…
 updated 2 years ago
 37 replies
 2 Medals
Mathematics

TomLikesPhysics:
Group Title
How do I find the total resistance of this network? Somehow I can not figure this simple network out.
 updated 2 years ago
 21 replies
 3 Medals
Mathematics

TomLikesPhysics:
Group Title
What forces act on the block with mass m2 (as seen on the picture)?
Gravity for sure but I guess the cylinder does also something. Perhaps …
 updated 2 years ago
 29 replies
 3 Medals
Mathematics

TomLikesPhysics:
Group Title
I have a matrix that rotates a vector about the x axis called X, a matrix that does the same for the y axis called Y and a Matrix called Z t…
 updated 2 years ago
 2 replies
 1 Medal
Mathematics

TomLikesPhysics:
Group Title
I have a question regarding the sum stuff with the big sigma.
 updated 2 years ago
 13 replies
 1 Medal
Mathematics

TomLikesPhysics:
Group Title
I need help with an integral.
 updated 2 years ago
 40 replies
 3 Medals
Mathematics

TomLikesPhysics:
Group Title
r(t)=(2t, wt, 4t) in cylindric coordinates. How do I find v(t)?
 updated 2 years ago
 16 replies
 2 Medals
Mathematics

TomLikesPhysics:
Group Title
I have 4 different vectors with 5 components. What is the fastest way to determine if these vectors form a linearly independent base in 5di…
 updated 2 years ago
 5 replies
 1 Medal
Mathematics

TomLikesPhysics:
Group Title
Where is the gradient of phi
a) perpendicular
b) parallel
…
 updated 2 years ago
 23 replies
 2 Medals
Mathematics

TomLikesPhysics:
Group Title
I am supposed to integrate Kepler´s second Law to find T (period) as a function of R (radius of a circle). However, this is a special case w…
 updated 2 years ago
 32 replies
 1 Medal
Mathematics

TomLikesPhysics:
Group Title
I want to find the length of a curve which is given by the equation: r=(tsint,1cost, 2).
To calculate the length I first calculate the fi…
 updated 2 years ago
 21 replies
 1 Medal
Mathematics

TomLikesPhysics:
Group Title
I have a parabola slide and I am looking for a function of the downhill force which only depends on the x and/or y coordinate.
I came up wi…
 updated 2 years ago
 17 replies
 1 Medal
Mathematics

TomLikesPhysics:
Group Title
I have two complex numbers:
z1=a+ib and z2=c+id
I am supposed to write them in that form: z=(rcos(theta), rain(theta)).
…
 updated 2 years ago
 12 replies
 2 Medals
Mathematics

TomLikesPhysics:
Group Title
I am looking for some simple mathebased game for a birthday party. Google could not help in that case. Does someone know a simple mathpart…
 updated 2 years ago
 8 replies
 1 Medal
Mathematics

TomLikesPhysics:
Group Title
Can someone check if I did this integral right?
I knew the answer to the integral so I do not know if every step along the way is right or …
 updated 2 years ago
 15 replies
 3 Medals
Mathematics
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