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Physics : Recent Questions and Answers (Page 328)

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

At what coordinate is the D-brane located in the T dual world?

I have a simple question on the geometrical intuition of D branes. I am currently reading the TASI notes by Polchinski. Say one has a bosonic open...

Asked on 05/18/2021

0 answer

Haag's comment on the relation between fields and particles

I am very confused by the statement made in Haag's, Local Quantum Physics: Fields, Particles, Algebras (page 46):... the idea that to each particle there is a corresponding field and...

Asked on 05/18/2021

4 answer

What is the formula for displacement in simple harmonic motion?

I am studying SHM in my physics class right now and I often get confused with the formula for displacement. Sometimes I see the formula written as $x=Asin(omega t)$...

Asked on 05/18/2021 by Harsh Darji

1 answer

SHM of a rigid body

In the analysis of SHM of a point sized bob oscillating with small angular displacement we can analyse the SHM in both linear and angular terms and arrive at the...

Asked on 05/18/2021 by Dhrxv

2 answer

Laplace's daemon in absence of global simultaneity

Laplace's daemon is said to be an entity that knows about the location and momentum of every particle in the universe at a specific moment in time and therefore can...

Asked on 05/18/2021 by Sandip Chitale

3 answer

Optimal power of a boxing punch - how important is mass?

I am intrigued by the physics of boxing, and why some people with fast hands do not have good punching power, ie, can not knock other boxers out. I feel...

Asked on 05/18/2021 by user261649

1 answer

Time-dependent thermal expansion of air?

Every solid, gas, liquid has a coefficient of thermal expansion (measured in e.g. %/K). This assumes an equilibrium state at the new temperature My question is: what is the time...

Asked on 05/18/2021 by cyuut

1 answer

What is the internal air pressure of a wrapped (with micro holes) food product heated in a microwave oven if I know how much steam is generated

Food product is in a sealed wrapper, with 44 laser cut holes of 150 micron. (0.7mm sq hole area total).When heated, product generates 2.2l of steam over 15 seconds. (33ml/sec)How...

Asked on 05/18/2021 by Ninkeebun

1 answer

Virtual vs Real image

I'm doing magnification and lens in class currently, and I really don't get why virtual and real images are called what they are. A virtual image occurs the object is...

Asked on 05/18/2021

4 answer

Why does the wavefunction of a particle spread out after a measurement?

Quantum mechanics states that the wave packet of a particle "spreads-out" in position again after a measurement on this particle has been made. Is this spreading or "dispersion" caused by...

Asked on 05/18/2021 by Rene Kail

3 answer

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