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Understanding constraint for not losing contact

What is the exact constraint for two bodies remain in contact? Consider the case of a rod constrained to move downward on an inclined wedge. It is known that the...

Asked on 12/17/2020 by Ramesh Gupta

2 answer

How to calculate acoustic impedance of a megaphone?

I'm working on a physics problem that asks how a passive megaphone (simple cone shape) can optimise the transfer of the human voice, compared to not using one at all....

Asked on 12/17/2020 by Aaron Lew

1 answer

Can a sound wave have such high frequency that it causes permanent displacement of medium?

Is it possible to have a sound wave with frequency so high that it causes permanent displacement of matter (the frequency is greater than the elasticity of the medium, so...

Asked on 12/17/2020 by Arieg

1 answer

Momentum in special relativity

I have been trying to understand absorption of a photon by a massive object, specifically the transfer of momentum and kinetic energy between the two. Starting from energy-momentum relation ...

Asked on 12/17/2020 by Salamander86

1 answer

How do you calculate the expected force of an electromagnet?

What is the equation to find the expected force of electromagnet? What do the variables mean and how do you find each variable?...

Asked on 12/17/2020 by sarah beth

1 answer

Why is it okay to replace the momentum operator with $p_x + im omega x$?

In this paper the momentum operator was replaced with something that looked very similar to the ladder operator for the non relativistic harmonic oscillator. They started with...

Asked on 12/17/2020

0 answer

Gibbs free energy intuition

What is Gibbs free energy? As my book explains:Gibbs energy is the energy of a system available for work.So, what does it want to tell? Why is it free?...

Asked on 12/17/2020 by user36790

7 answer

How does a tension lever exert different tensions with only one mass?

This is a diagram of a tension lever. Tension exerted by this tool only depends on where you hang a mass....

Asked on 12/17/2020 by i9100

2 answer

How to prove the equivalence of two different definitions of $S$-operator?

I read there are two definitions about $S$-operator: The first one (e.g (8.49) in Greiner's Field Quantization) is:$$S_{fi}equiv langle Psi_p^{-}| Psi_k^{+}rangle$$where $|Psi_p^{-}rangle$...

Asked on 12/17/2020 by 346699

1 answer

Is the attenuation constant in EM wave equation a vector or tensor?

In general, an EM wave within a lossy medium is expressed as$mathbf{E}=mathbf{E_0}e^{-gamma_x x-gamma_y y-gamma_z z}$.If we consider $mathbf{gamma}=gamma_x hat{x}+gamma_y hat{y}+gamma_z hat{z}$ and $mathbf{r}=xhat{x}+yhat{y}+zhat{z}$, the above...

Asked on 12/17/2020 by susovan0010

0 answer

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