Capacitor+work energy theorem problem

August 6, 2018, 9:13 pm

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1. The problem statement, all variables and given/known data
Plate a of a parallel-plate, air filled capacitor is connected to a spring having force
constant k, and plate b is fixed. They rest on a table top.If a charge +Q is placed on plate a and a charge −Q is placed on plate b, by how...

Capacitor+work energy theorem problem

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RF Power Meter / SWR Meter Equivalent Circuit

August 6, 2018, 9:16 pm

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I'm starting to get into RF electronics, and an upcoming project involves the use of a power meter / SWR meter. How do we model a power meter in terms of an equivalent circuit? i.e. is it just another impedance? or a transformer? or does it...

RF Power Meter / SWR Meter Equivalent Circuit

Black Hole Topology

August 6, 2018, 9:20 pm

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Can a black hole be presented as a Heegaard decomposition or as the complement of a knot?

I'll try and elaborate: If I understand correctly, the cross section of spacetime near a black hole can be thought of topologically as a manifold. What manifold is it? Can the manifold be decomposed?

Best way to heat up metal plates?

August 6, 2018, 9:27 pm

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Hey there! I want to make a rosin press from scratch.
I have a big press with 2 inch thick metal plates, probably about 4 inches wide and 10 inches long.
I need to heat these plates up to 230 degrees Fahrenheit and press them against each other with product in between them.
I am going to fasten...

Best way to heat up metal plates?

Cutnell Physics 10e -- I am considering this text for my high school Honors/AP course...

August 6, 2018, 9:41 pm

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I am considering this text for my high school Honors/AP course. Do you have an opinion of the text and its online Wiley PLUS with ORION Advantage?

E-field generated by constant current in a circular loop

August 6, 2018, 9:48 pm

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1. The problem statement, all variables and given/known data

Discussions of the possibility of a tangential E-field external to a current-carrying conductor must include a voltage source and a return path. Here the problem is reduced to (we believe) the simplest possible geometry. Assume...

E-field generated by constant current in a circular loop

Space Stuff and Launch Info

August 6, 2018, 9:50 pm

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Due to the constant never ending supply of "cool stuff" happening in Aerospace these days I'm creating this thread to consolidate posts every time something new comes along. Please feel free to add random information if its relevant. So to start things off here is the SpaceX Dragon launch coming...

Space Stuff and Launch Info

CS vs Software Engineering degree

August 6, 2018, 9:54 pm

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I'm looking into completing my degree online mostly due to the cost of tuition at a traditional university. The online programs I've been looking offer Computer Science while some offered Software Engineering. I was wondering which degree is the better option?

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Sorting (Worst Time Analysis)

August 6, 2018, 10:00 pm

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The question(s) here can be asked for many problems (and not just sorting).

Let's consider the standard case of sorting an array of size ##n## containing numbers. If we consider a naive algorithm, its time would be proportional to ##n^2##. For example, the naive algorithm could be proceed with...

Sorting (Worst Time Analysis)

A good book that covers everything?

August 7, 2018, 8:27 am

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Hello!

About Me:
I'm an Electrical And Computer Engineer under graded student. The only physics we learn in the University in which I'm enrolled is Electromagnetics and nothing more. Well in high school we learned Classical Physics but i don't remember anything (Except some of Newton's...

A good book that covers everything?

Find the equivalent capacitance of the circuit

August 7, 2018, 8:48 am

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1. The problem statement, all variables and given/known data
Find equivalent capacitance between A and B of the given figure (pardon camera quality)

2. Relevant equations
All related

3. The attempt at a solution
marking junctions, From left to right, starting from original...

Find the equivalent capacitance of the circuit

MCNP diagnostic X-ray tube simulation

August 7, 2018, 8:50 am

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Dear all,

I would like to simulate X-ray tube and check the dose rate in the room.
My problem is when I simulate 80kV electrons bombard to the tungsten target, there is just a few photons coming out from the tube window. And the dose rate at 1m from the tube is nearly zero which is impossible....

MCNP diagnostic X-ray tube simulation

Deflection of wave in dissipative media with a complex refractive index

August 7, 2018, 8:54 am

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1. The problem statement, all variables and given/known data
A monochromatic plane wave with wavelength 500µm is propagating through a dissipative medium with refractive index 1-0.0002i. It approaching the edge of the medium, and will pass out into free space. If the angle of incidence is...

Deflection of wave in dissipative media with a complex refractive index

Area of a triangle

August 7, 2018, 9:01 am

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1. The problem statement, all variables and given/known data
Find the area of a triangle, assume that you don't know the formula of area of any other figure.

2. Relevant equations


3. The attempt at a solution
Well, i was trying to figure out how to find the area of a...

Area of a triangle

Why are many religions submissive?

August 7, 2018, 9:33 am

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I noticed a general trend in religions. There is always some overlord that creates the universe and that humans must all submit to such an overlord or overlords. Why?

It is not necessarily logical, even without science, that an overlord is needed to spawn reality. I mean, one can just as easily...

Why are many religions submissive?

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Collapse and unitary evolution

August 7, 2018, 9:36 am

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In his book "the black hole war" Susskind writes that in quantum mechanics information cannot be lost because it is unitary. As collapse is not unitary does he say that collapse never occurs?

What are you reading now? (STEM only)

August 7, 2018, 9:44 am

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What book are you reading now, or have been reading recently? Only STEM (science, technology, engineering and mathematics) books are counted.

Capacitance from plates

August 7, 2018, 9:55 am

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1. The problem statement, all variables and given/known data
Five plates with same area are placed as in figure. Distance between any 2 consecutive plates is d. Find equivalent capacitance(ab). (Note-Answer is given as 5C/3, in terms of C so I suppose C is capacitance of a +ve and -ve...

Capacitance from plates

Research for a book

August 7, 2018, 10:19 am

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I’m wanting to write a realistic sci-fi book but there are a few concepts I don’t understand how to apply. I’m not good with physics so what I’m wanting to know is how to calculate what pressure and temperature would be required for sustained nuclear fusion for something comparable to a star...

Research for a book

Hello everyone

August 7, 2018, 10:46 am

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Reading up on threads on the site!
Love to read and study physics, more difficulty with the maths....
Hoping to get inspiration and insight!

Thank you all for sharing!

Amy