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Physics : Recent Questions and Answers (Page 47)

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

When to use Ohm's law as opposed to using power formula?

I am a mechanic trying to gain a better understanding of electrical theory on vehicles. I have a sound understanding of Ohm's law and also the power formula (Power =...

Asked on 10/03/2021

2 answer

Is diffraction empirically derived or based off something else?

after reading about diffraction I am confused on how its effect came to be understood. Can one derive diffraction from the wave equation and base principles or is it a...

Asked on 10/03/2021

1 answer

Vector representation of wavefunction in quantum mechanics?

I am new to quantum mechanics, and I just studied some parts of "wave mechanics" version of quantum mechanics. But I heard that wavefunction can be represented as vector in...

Asked on 10/03/2021 by user23145

3 answer

How big is a 1kW fire?

What is the size/scale of a wood fire that is producing 1kW? I'd like to improve my ability to conceptualize various power scales....

Asked on 10/03/2021

4 answer

Change in Length of an element of spring

Lets say that we have a spring, with spring constant k. It has an orignal length of $l_1$ and after stretching it a length of $l_2$. Now lets...

Asked on 10/03/2021

1 answer

Limit to the Oberth effect in a supermassive Black Hole flyby

To make this question clear, here are the details of the situation I wish to entertain.A spacecraft does a powered gravitational assist, where it fires engines in a near-approach to...

Asked on 10/03/2021

1 answer

Trying to visually understand Ampere's Law

When deriving the magnetic field due to a current carrying wire, if we choose a circular Amperian loop, we can state: $$oint vec B cdot dvec s = mu_0...

Asked on 10/03/2021

2 answer

Electron superposition in an $m$-level system

I understand second quantization, and how absorption and spontaneous/stimulated emission works for an electron in $m$-level system. In other words, I know how a photon with the right frequency...

Asked on 10/03/2021 by diemilio

0 answer

Where does the wormhole go?

I'm familiar with the basic idea of what a wormhole (Einstein-Rosen bridge) is and have seen many varied visualizations of what it would perhaps look like if you met one....

Asked on 10/03/2021

1 answer

Confusion about relation between inertial an non-inertial reference frames in respect tto the motion of a rigid body

In "Analytical Mechanics" by N. A. Lemos, in page 99 the author determines the time derivative relation between an inertial frame $Sigma$ an an non-inertial frame ...

Asked on 10/03/2021 by Geni Rataria

1 answer

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