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Physics : Recent Questions and Answers (Page 551)

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

Collinear factorisation in QCD: why can we multiply probabilities?

In the collinear factorisation equation for a QCD cross-section, schematically$$sigma_{ABto X}=f^A_a otimes hat{sigma}_{abto X} otimes f^B_b,$$we essentially convolute the probability of producing...

Asked on 02/19/2021 by JCW

2 answer

Spontaneous symmetry breaking, massless bosons and the equations of motion

I am currently studying spontaneous symmetry breaking, and I don't entirely understand the implications of what we are doing at certain places. Consider the standard complex scalar field with the...

Asked on 02/19/2021 by Rahul Arvind

1 answer

How do deep-seeking "two-box" metal detectors work?

There is a type of metal detector known as a "two-box" metal detector, which is able to find much deeper objects than a traditional metal detector. The back coil is...

Asked on 02/19/2021 by Luke Hutchison

0 answer

Please help me formulate (and solve) a differential equation for a practical DIY problem concerning air sterilization (for covid)

Here I present the DIY air sterilisation project which this is about. I want to calculate the overall sterilization rate of the device under some simplifying assumptions....

Asked on 02/19/2021

0 answer

How does the temperature and humidity of air affect the water consumption of a humidifier?

We can model the water consumption $dot{m}_{w}$ of a simple humidifier using the following equations: begin{align}eta_{hum} & = {T_{db,i} - T_{db,o} over T_{db,i} - T_{wb,i}}h_{o} &...

Asked on 02/19/2021 by Florent H

1 answer

Why is Newton's second law with potentials not a linear equations?

I was trying to learn Quantum physics by myself using MIT's 8.04 course. I came accross this equation: I don't...

Asked on 02/19/2021

2 answer

Which are the best books I can refer for turbulent heat transfer and its computation?

I am a graduate student. I wanted to do computation on heat transfer problem mainly heat convection. I am working on turbulent regime. Can you kindly suggest some good books...

Asked on 02/19/2021 by Vishnu

1 answer

What happens to the resistance, voltage and current when DC passes through saltwater?

I have a circuit of a battery(1.5V or 9V) connected to a multimeter, a connected to 2 metal pieces in water(distilled)(see picture, in place of the LED is a multimeter)....

Asked on 02/19/2021

2 answer

Expanding Newton's Second Law and changing $v$ to $V_e$ gives you the rocket equation. Where does this change of $vto V_e$ come from?

I've noticed that from Newton's Second Law, if you expand the right side using the product rule and change the v to Ve, the rocket equation appears very easily... ...

Asked on 02/19/2021 by Ayden Cook

1 answer

Microscopic description of thermal conduction in steady-state

In the steady-state condition of thermal conduction the temperature at each point of a rod becomes constant w.r.t time but there is a temperature gradient! I can understand it from...

Asked on 02/18/2021 by PRITAM the cat of Newton

2 answer

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