Recent content by nabeel17

I am having a hard time understanding vector transformations. I know that vectors must transform a certain way and that dual vectors (or covectors) transform the "opposite" way. What is strange to me is that the basis vectors transform like dual vectors and the basis dual vectors transform like...

It is for 6 terms and I have been offered aprox 50k for it which seems decent. I don't know what to do. I don't want to regret my decision later. I suppose since it is my only offer, its my only choice? But I feel like theoretical cosmology is all I want to do now..

I had a lot of trouble in my early undergraduate career and had received some really bad grades. I retook a lot of courses and after 6 years, I am finally graduating with good marks in my third and fourth year courses and I believe I have an overall good understanding of undergraduate physics. I...

Is the time derivative of a curl commutative? I think I may have answered this question... Only the partial time derivative of a curl is commutative? The total time derivative is not, since for example in cartesian coordinates, x,y,and z can themselves be functions of time. In spherical and...

rdrdtheta but what are the limits?

right so I can just multiply by 2pi and integrate with respect to r. But I don't know how to integrate this. My value of r will be a multiple of c...so I can rewrite r as n*c? and try integrating that?

Homework Statement I have to determine the radius at which 50% of energy is in a Gaussian profile.Homework Equations The intensity is given by I=Ioe^(-r/2c)^2. This is just a gaussian function ofcourse. The Attempt at a Solution I know c is the standard deviation. I searched through charts...

When I think of frequency, I think of something happening per second or per unit time. When light is a wave, I can understand that it has a frequency, but when it is a particle like a photon, what is the interpretation of its frequency? What is occurring per unit time? Or do we associate a...

Ok so with respect to some origin, a point mass will have angular momentum given by rxp where where r is the distance from the origin. Even if it appears to be going straight with no rotation correct? So angular momentum is always defined with respect to an origin

I was doing a question in Taylor book (example 3.3) where a sticky putty is thrown at a stationary wheel. To solve it we use conservation of angular momentum. What I am confused about is that the wheel is initially at rest and has no angular momentum initially. But when the putty is thrown at it...

Yes but young Earth believers don't believe in carbon dating, so I didn't want to seem skeptical or seem like a young Earth theorist by asking about it. Carbon dating effectively disproves that the Earth is younger than 10000 years so it blows my mind how many people still believe this

Thank you all! So there is a slight variation in the carbon ratio over the last couple thousand years and it is non negligible?

Before I start, I'm not some young Earth believer or anything, just want to understand how it works and if the assumptions are fair. So my understanding of carbon dating is that the ratio of C14 to C 12 is known (About 1 trillion to 1) and it is the same in the atmosphere as it is in organic...

Ok so when the qq* pair are produced they will emit 2 gluons that will each turn to jets (in the case of 2 jet events)? Also these gluons must be very energetic to conserve energy of all the particles created in the jet right?

Consider e+e* -> q+q* in the centre of mass frame. Where I am using star for antiparticle. the quark and anti quark pair cannot exist alone due to color confinement so they form 2 jets that will go in opposite directions (to conserve momenta). Where do these jets come from? Do the...