Recent content by C_Ovidiu

As much as I tried to understand all the responses posted I could not. Firtly, I do not know how to draw space-time diagram. Secondly, I would like to know how to solve this problem using the second method and using only Lorentz transformations. Can someone explain to me how this can be done...

Why would that be so? The Earth is still and in Earth's frame the two velocities simply add. I compared the time t_a yielded by the two types of rationing , that it the time until collision in A's frame of reference. The first rationing mode is from "A guide to physics problems" -Cahn S...

A person on Earth observes two rockets moving directly toward each other and colliding. At time t=0 in the Earth frame observer determines that rocket A, traveling to the right at v_a=0.8c is at point a and rocket B traveling to the left at v_b=0.6c is at point b. They are separated by a...

Say we have a cilinder, thermally isolated from the environment, divided in two parts by a piston. In the left part we have an ideal gas, in the right part an unstretched spring. After we set free the piston, in the final phase, we fin that the gas' volume has doubled, while it's temperature is...

Tnx.

let's say we have two coordinate systems ( S-OXYZ and S'-O'X'Y'Z') , S' moving with velocity v away from S . At t=0 O=O'. According to Lorentz' transformations we have : At t=0 x in as a function of x' : x=\frac{x'}{\sqrt{1-\beta^2}}=x'\gamma Now, say I know x(I just found it above) ...

Tks. I shall learn this latex .

Nobody ( just) did

Say we have the ecuations below a,b,c positive numbers sin(A)=a/sqrt(a^2+b^2) 1 sin(B)=a/sqrt(a^2+c^2) 2 sin(A)cos(A)=sin(B)cos(B) 3 I realized that calculating cos(A) and cos(B) and then solving the third ecuations i get the solutions b=c and a^2=bc But solving only...

Can you please confuse me a little bit more and tell me what aproximations are made so we can go from Stefan Boltzmann law to the Newton's law under specific circumstances . It's a pretty big difference thou.

I found in various manuals that the power given to the environment has the formula P=k*(T2-T0) . T0 being the temperature of the environment . Is this formula right ? In other I found that the power given is P=kT^4, T being the temperature of the body . I'm confused !

b(1)=2 , a(2)=3 ===>a(b(1))=3

a= 1 3 4 2 b= 2 4 1 3 ab= 3 2 1 4

Say you have b= 3 4 2 1 the grade is 4 ab means a*b that means ab=(a(b(1)), a(b(2)), a(b(3))... a(b(n)) )

Homework Statement let there be a and b (b taking any value) two permutation with the same grade .demonstrate that ab=ba <=> a=e(e=the identical permutation) . Homework Equations e=(1234) (1234) The Attempt at a Solution Don't have a clue with what to start/end