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Physics : Recent Questions and Answers (Page 310)

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

Energy density of Induced Electric Field

For electrostatic fields, we write the energy density using $$u = frac12epsilon_o E^2$$ is this formula also valid for a non-conservative electric field produced by changing magnetic field? Or,...

Asked on 05/25/2021

2 answer

Neutral points in an electrical circuit?

I have been told that potential in an electric circuit is defined as the work done in bringing a unit test positive charge to that point inside the circuit. Thus...

Asked on 05/25/2021 by LiQuid_ NitRoGeN

3 answer

Structural dynamics: Why are modeshape-vectors referred to as orthogonal?

When dealing with an undamped MDOF dynamic system, one can find the natural frequency (eigenvalue) and corresponding modeshape-vector (eigenvector) for mode $n$ by solving the eigenvalue problem: $$...

Asked on 05/25/2021 by MMU_SDU

0 answer

Electron heat capacity vs phonon heat capacity

For metals, the heat capacity has two contributions. The phonon contribution is proportional to $T^3$, while the electron contribution is proportional to $T$, as $T$ goes to...

Asked on 05/25/2021

2 answer

Relativistic Jets in Black Holes

It is understood till now that nothing is faster than speed of light and we also know that even light cannot come out of black hole(that’s why the name black)....

Asked on 05/25/2021 by Ayush Bhardwaj

1 answer

Can we Predict the Trajectory of a hypersonic missile?

I read in a newspaper that we can't predict the trajectory of a hypersonic missile and that this property renders the missile undetectable. However, what I could not understand is...

Asked on 05/25/2021

2 answer

Is String Theory proven to be finite?

I read Lee Smolin's book "The trouble with physics" and the book says that the finiteness of string theory ( or string pertubative theory) is by no means a...

Asked on 05/25/2021

2 answer

How to determine the focal length of a combination of two convex lenses separated by a distance $d$ experimentally without formula?

I have done this experiment to find out the equivalent focal length of a combination of 2 convex lenses of slightly different focal length and have applied the formula for...

Asked on 05/25/2021 by Rinchen Chosdol

1 answer

In block wedge system why horizontal component of normal doesn't affect the momentum of the system?

Diag. For ques: In that L shaped wedge of 4kg a block of 1kg is released from top... We give...

Asked on 05/25/2021 by Faham J

1 answer

Why dont low density objects like nylon not fly into the air with more density?

According to this Website Nylon has a density between 1.11 to 1.18 g/cm3. Air on see level has a density of 1.225 g/cm3. So why does nylon...

Asked on 05/25/2021 by Walter Bislin

2 answer

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