Firstly,I would like to ask

Is coordinate system necessarily be there

1) If there are two positive...

Conditions for neutral point to exist]]>

Imagine for a moment that there is a hot air balloon which has a strong shell forming the balloons shape rather than one made from material and it weighs the same as a...

Air density, vacuum and gravity]]>

Calculate the 'Feel' of a Drumhead?]]>

Voltage in a Circuit]]>

potential at any point r=V

While source charge is Q...

How to find potential *Energy* between two point charges?]]>

Thank you]]>

I have been pondering and pondering on how this is actually possible. If you think about it, the buckets are actually holding down the table....

Floating Table (With Buckets)]]>

difference between IR and heat]]>

2. to have charge in order to magnetic property?]]>

The reasoning is the peak and trough of the sine wave both deliver a peak in candescence ie two peaks per cycle therefore 100Hz flicker??

Will be settled by experiment soon as we...

incandescent bulb flicker?]]>

if moment is what makes things rotate, imagine this :

....................................... F (pushing down the stick)

A

so :

1. the stick will rotate in a clockwise direction,

2. but the direction of the...

Statics :ã€€Direction of Moments]]>

Why does the internal energy have a lower bound?

I tried to explain it using postulates, but cannot get the connection between the postulates. Please do explain it briefly. Thank you.]]>

Is it possible to attach 2 cars with magnetic force so that they can be driving as one? (one car in the front and another car behind)

I think it can be done with magnetic force but how..

Also, Is it...

cars attaching to one another using magnetic force]]>

Using the Maxwell-Boltzmann equation above, there is an example in my book (Giancoli 4th edition p. 481) where they use this to find the average velocity. I understand that it would just be the sum of all...

Average Speed for Maxwell's Distribution of Molecular Speed]]>

any...

calculating force on a punching bag?]]>

I would like to evaluate the required work to create a 1 T field with a permanent magnet. I saw a few formulas on the internet, but I don't know how to use them correctly. The main one are

[itex]B={{\mu }_{0}}\left( H+M \right)[/itex]

[itex]{{W}_{mag}}=\frac{{{B}^{2}}}{2{{\mu...

Work done by permanent magnet]]>

Friends! Please explain in simpler...

Changing Identity]]>

There was a question

In figure two points A and B are located in a region of electric field.,The potential difference ##V

1-positive

2-Negative...

potential difference: positive or negative?]]>

Possible non-burning visible beam mock-up?]]>

I am just trying to understand the output of a sound spectrum analyzer. There are three dimensions

1) Time

2) Frequency

3) Volume (db)

I am confused about few things here:

1) How should I perceive the volume dimension here?

2) Why are the db values negative here and w.r.t what reference...

Understanding a sound spectrum analyzer output]]>

Proof/Explanation to why bullet hits the apple]]>

I've got a serious problem. Generally I know why current flows (free electrons and voltage). But some days ago I was considering about regular battery and electrical circut.

Free electrons in wire flow along circut, ok, that's fine and understandable. But how does battery...

Electric current]]>

What I mean is that, say we start with a 'starting point' equation, in this example Ficks law of diffusion (wikipedia:):

[tex] J = -D \frac{\delta...

Understanding the physical meaning of multiplication, etc]]>

Is the speed of light constant at all speeds? So will the speed of light (3 x 10^8 m/s) be the same if a person was travelling at 1000 km/hr and if they were stationary.

Thanks]]>

I am planning to write something along these lines, but I want to see if anyone can tell me if I'm missing something here:

"Imagine a rod that is connected in a frictionless and weightless...

Instantaneous communication]]>

Time and matter, is there a smallest unit?]]>

How we measure time]]>

I am an artist. I am looking for an answer on the nature of sight. What is the best explanation for how sight occurs. Do we see a 3D world illuminated by 2D photons? Can we...

2D or 3D?]]>

In this paper...

What is a phase transition in the context of an ising glass?]]>

I want to ask how do I extrapolate a correlation from a bunch of numbers. I did and experiment on gyroscopes, and have three kinds of data, w1, w3 and F_t, the later two can be used to calculate L3 and T_g. My...

How do I analyze data?]]>

I understand that the equation to calculate the maximum height of a projectile (ignoring wind resistance) is

H

Maximum height of ball with changing acceleration]]>

However, I know that when the paddle is moving in one direction, when the ball collides with the moving paddle, the ball should bounce of with a...

Momentum of a ball]]>

If suddenly an object goes about 689 degrees farenheit (365 degrees celsius) in a room, about which perimeter would human life be impossible ?]]>