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Physics : Recent Questions and Answers (Page 178)

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

Gradient in cylindrical coordinate using covariant derivative

I'm reading a little pdf book as an introduction to tensor analysis ("Quick introduction to tensor analysis", by R. A. Sharipov). I've reached the last section where it is explained...

Asked on 07/18/2021 by Luke__

1 answer

Electric field at the centre of a hemispherical shell

To find out the electric field at the centre of the hemispherical shell, I considered an elemental strip to be a ring, calculated the electric field due to it and...

Asked on 07/18/2021

0 answer

Where does the Berry phase of $pi$ come from in a topological insulator?

The Berry connection and the Berry phase should be related. Now for a topological insulator (TI) (or to be more precise, for a quantum spin hall state, but I think...

Asked on 07/18/2021

0 answer

Why does light not produce sound?

We have heard about the definition of a wave - disturbance in the matter or something. But can we think that light is a wave and so does it have...

Asked on 07/18/2021 by Prof. Meow

3 answer

Physics of Striking in Combat Sports

I was reading a blog post about the "physics of muay thai kickboxing" (https://heatrick.com/2013/10/13/the-science-of-muay-thai-lesson-1/) in which the author states that the main perspectives to consider here are...

Asked on 07/18/2021 by AnotherPerson

1 answer

What determines if a lamp produces emission or blackbody spectra?

If we take a lamp containing hydrogen gas and heat it up (gas-discharge lamp), it produces hydrogen's emission spectrum. Why doesn't it produce a blackbody spectrum? After all,...

Asked on 07/18/2021

4 answer

If you apply a force against a fixed body (no motion) for a certain period time, is the resulting force time integral an impulse?

Say I'm 100 kg and hanging off a pullup bar for 10s. The force-time integral over that period would be FTI = 9.81 kNs But do I apply an impulse?...

Asked on 07/18/2021 by user1323995

1 answer

Difference between photogalvanic effect and Photovoltaic effect

What is the difference between the two phenomena, photovoltaic and photogalvanic effect? I can't find any difference between them. Both are generation of current when a material is illuminated with...

Asked on 07/18/2021

0 answer

If lower gear generates more torque at the wheel, why does it generate less acceleration/speed of the car compared to higher gear?

If lower gear generates more torque (compared to higher gear) at the wheel, that would presumably mean the wheels can exert more force on the floor to propel the car...

Asked on 07/18/2021

2 answer

Describing travelling waves carrying energy from one point to another

A simple harmonic wave in one-dimension (for simplicity) $y(x,t)=Asin(omega t-kx)$ in a medium is often presented as an example of a travelling wave. But such a plane wave is infinitely...

Asked on 07/18/2021

3 answer

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