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Physics : Recent Questions and Answers (Page 808)

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

Basic question on friction

Consider the whole system initially at rest. Suppose there is friction between the blocks, but not between the lower block and the floor....

Asked on 10/27/2020

3 answer

Why do solenoids attract ferromagnetic substances?

In this Veritasium video, Derek explains why solenoids (electromagnets) work. But I have a confusion. He only explained the case when the solenoid (electromagnet) attracts a...

Asked on 10/26/2020 by Abu Safwan Md farhan

2 answer

What does it mean by positive carriers (holes) carrying heat?

This is related to the Peltier effect. Using N-type semiconductor as a thermoelectric material, when a voltage is applied across it the majority charge carriers (electrons) move from the negative...

Asked on 10/26/2020 by Knight

1 answer

How to derive the thermodynamic activity?

From wikipedia thermodynamic activity is given as$$ a = exp left(frac{mu - mu_{0}} {RT}right)$$which becomes,$$ RTln(a) = mu - mu_{0}tag{1}$$ And i have to do...

Asked on 10/26/2020 by Basant Acharya

0 answer

Why is there so few Helium on (inside) Earth?

According to this article, there is a large quantity of Helium in space (stars), but very little is accessible to us on Earth:Helium is abundant in space,...

Asked on 10/26/2020 by Alexei

0 answer

Doesn't the neutron's lack of an electric dipole moment conflict with the concept of baryons having a radius?

The proton radius puzzle appears to one of the more widely known unsolved problems in physics, but doesn't it point to a much deeper issue? Nearly all of a baryon's...

Asked on 10/25/2020 by QuaternionsRock

2 answer

Distance from Instantaneous Centre of Rotation in Bicycle Kinematic Model

I'm not sure whether this is the correct community to post this, so pardon me. I was studying the Bicycle Kinematic Model and came across 3 possible reference points for...

Asked on 10/25/2020 by Harish Iniyarajan

2 answer

Magnetic field created by a charge of constant velocity

My textbook states the following: " If a charge's velocity is constant, the rate-of-change of the $E$-field is steady, and the resulting $B$-field is constant.". To my understanding,...

Asked on 10/25/2020

3 answer

Potential function in fluids

Question: Show that the potential function is a non-exact differential (or a non-analytic function) for two-dimensional rotational flow. Doubt: I know what a potential function and its relation with components...

Asked on 10/25/2020 by Alpha

1 answer

Determine the point at which moment vector is zero on a 3D body

I have information about total force and moment on a body for three points, whose coordinates I know. From this information I would like to determine the point at which...

Asked on 10/25/2020 by HotDogCannon

2 answer

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