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Physics : Recent Questions and Answers (Page 828)

Find answers to your questions about Physics or help others by answering their Physics questions.

How is weight $W = 0$?

One of my physics teachers told me that in the formula of calculating weight i.e. $W = mg$, $m$ is not equal to 0 until and unless you're...

Asked on 09/16/2020 by Physics07

2 answer

Is minimizing the action same as minimizing the energy?

When we differentiate the total energy with respect to the time and set it to zero (make it stationary), we get an expression as similar to what we get while...

Asked on 09/15/2020 by Tom Curran

3 answer

Calculating (transient) rate of cycles of practical thermodynamic engines (turbojet, multi-cylinder car engines etc..)

I tried to make a plan for a turbojet engine with my physics knowledge and I'm stumped in the first step. For any sustained real engine, I need to somehow...

Asked on 09/15/2020 by Rajat Mondal

0 answer

Which weighs more in atmosphere, $1,{rm kg}$ of steel or $1,{rm kg}$ of feathers?

I'm having a discussion at the moment regarding the mass of $1,{rm kg}$ of feathers and $1,{rm kg}$ of steel. The person I'm arguing with states that ...

Asked on 09/15/2020 by James Thorpe

4 answer

Does "Crack The Whip" actually speed you up?

"Crack The Whip" is a game played on ice skating rinks where several individuals line up all facing the opposite end of the rink, and skate forward. When the group...

Asked on 09/15/2020 by Mark Baldridge

1 answer

Resonance propagator properties

(This is part c & d of problem 7.9 from Schwartz' book on QFT).Show that a propagator only has an imaginary part if it goes on-shell. Explicitly, show that ...

Asked on 09/15/2020 by Alex Marshall

2 answer

Numerical scheme Fokker-Planck Diffusion

assuming the diffusive motion of a substance $u(x,t)$ depends on a variable $b(u(x,t))$.Fickian Diffusion then reads$$ frac{partial u}{partial t}=frac{partial}{partial x}left(D(b(u(x,t)))frac{partial u}{partial x}right)$$Conversely, the Fokker-Planck equation reads...

Asked on 09/14/2020 by gumpel

2 answer

When we use magnets in linear accelerators?

I'm searching particle accelerators. I couldn't see focusing magnets in Linear accelerators. When we need focusing magnets in Linacs? I'm sharing some photos of what ı found....

Asked on 09/14/2020 by Furkan Kahveci

1 answer

Question about $rm AdS$ conformal boundary in Poincare coordinates

I've worked $rm AdS$ using global coordinates and the ideas of a conformal boundary is plausible. Radial $rho$ coordinate can be compactified and we can study its conformal...

Asked on 09/14/2020 by OMAR MEDINA BAUTISTA

1 answer

What is the difference between ion beam and laser?

What is the difference between laser beams and ion beams, especially in inertial confinement fusion? In inertial fusion, we use lasers as well as ion beams for driving the reaction....

Asked on 09/13/2020 by user68857

1 answer

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