Physics Questions, Problems & Solutions : TransWikia.com ~ Page 340

Does a traceless energy-momentum tensor really imply a massless field?

I read a paper where there was written that "a Traceless Energy-momentum Tensor implies a massless field", so I did a bit of calculations but I seems not really true,...

Asked on 05/13/2021

0 answer

How the cosmological scale factor $a(t)$ will have maximum value followed by a contracting phase of the universe?

The scale factor satisfies the following equation -$$frac{dot a^{2}}{a^{2}} + frac{k}{a^{2}} = frac{8pi G}{3} rho(t)$$ where $k$ is constant proportional to total energy of the dynamical system. Now ...

Asked on 05/13/2021 by luv_phy

2 answer

How do wavelengths add-up?

If I have 3 LED lights of following colors and wavengths: Red 650 nmBlue 450 nmGreen 550 nm All three are placed side by side and turned ON.....

Asked on 05/13/2021

2 answer

If the world had four spatial dimensions, then area would be a tensor?

In three dimensions area is a vector because two dimensions have a direction relative to the third. If the world had four spatial dimensions then area would be a tensor?...

Asked on 05/13/2021 by Larsa se eidaklaxtarsa

1 answer

I was told that if the Moon had a retrograde orbit, tides would have a faster rhythm. Why is that?

Would this be because tidal deceleration causing the Earth to spin faster or are there other actions in play that I haven't considered? Would the Earth even spin faster because...

Asked on 05/13/2021 by Marcello Nicoletti

3 answer

Fluid statics and and pressure

consider a fluid filled in a cylindrical container height $h$ and area of cross section $a$. The pressure at the bottom will be: $$p_0+rho gh$$ but not...

Asked on 05/13/2021 by Anudeep Rao Perala

2 answer

Is it better to wear black clothes in the summer?

Okay I saw all these people saying that new studies show black is better to wear in the heat. They say it's cause "black clothes absorb the heat emitted by...

Asked on 05/13/2021 by Pong Lenis

3 answer

How fast do you have to spin an egg to have it standing?

If you take a hardboiled egg and put it on a table and start to spin it, if you spin it fast enough it will start to spin in an...

Asked on 05/13/2021 by TROLLHUNTER

3 answer

Reference request for path integral representation of 2D Ising model

I'm looking for references that discuss the path integral approach for the two-dimensional Ising model, constructed from its transfer matrix. The only reference I know on the topic is ...

Asked on 05/13/2021

1 answer

Need Help Understanding Why $Delta vec{v}$ is Perpendicular to $vec{v}$

I am confused about the statement of how vector $Delta vec{v}$ is perpendicular to vector. I highlighted the statement in pink. I ended up copying the image of the...

Asked on 05/13/2021

1 answer

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