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Physics : Recent Questions and Answers (Page 168)

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

The Egg Smashing Tournament

My cousins and I have a annual egg breaking tournament. First, each of us gets a hard boiled egg. Then, in a bracket tournament style, a pair of us face...

Asked on 07/22/2021 by sherz1

1 answer

Variable mass systems

I'm studying this article: https://ocw.mit.edu/courses/aeronautics-and-astronautics/16-07-dynamics-fall-2009/lecture-notes/MIT16_07F09_Lec14.pdf and I have the following doubt: On page 3, when he derives the equation of motion (11), he says that the external...

Asked on 07/22/2021

2 answer

Reconcile different definitions of temperature

In classical thermodynamics, one way to define the temperature is to measure the efficiency of the Carnot cycle, i.e.$$w = 1-frac{T_c}{T_h}$$ And in some other texts (like in...

Asked on 07/22/2021 by jane886

3 answer

What's the formula for the brightness of a signal mirror viewed at distance X, in space?

What's the formula for the maximum brightness of a triangle-shaped, flat signal mirror G with area A in orbit radius O around star S with brightness B and diameter D...

Asked on 07/22/2021

1 answer

Tensor index in special relativity?

I'm studying special relativity and I have some difficulties with tensor index. Take for example the Lorentz matrix, whose elements are written as $Lambda^mu{}_nu$. $Lambda^mu{}_nu(v) = begin{bmatrix}...

Asked on 07/22/2021

2 answer

Expansion after a shock wave in a de Laval nozzle

I've performed a CFD of a flow inside a nozzle and I'm evaluating the differences between various settings. I cannot find a reason why after the shock wave formed in...

Asked on 07/22/2021 by wilove

1 answer

Does the sea level increase if an iceberg melts?

It was claimed that if an iceberg melts in the ocean, the sea level won't change as the ice displaces as much water as there will be melted water. The...

Asked on 07/22/2021

6 answer

Cylindrical coordinates of a ring

A classical problem for electromagnetism students is the calculation of the electric field on the central axis of a ring. It can be solved in many different ways, but I...

Asked on 07/22/2021

2 answer

What does dot product really mean?

While calculating the flux of a vector field through a region, we need to find the normal components of the vector field i.e perpendicular to the surface. Now I don't...

Asked on 07/22/2021

1 answer

Why does potential energy time-derivative depend only on the mass flow?

This is a homework exercise, but I don't want specifically to tell me how to resolve the exercise. I want...

Asked on 07/22/2021

2 answer

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