The Great Pyramid of Khufu 139 meters high. The top has been experiencing a slower passage of time than the bottom for some 5,000 years. Yet they are in the same location in space-time. Mount Everest...

Is our time browser based?]]>

Then I...

Fun question: Can this fish swim?]]>

I need some *Rust* is iron oxide rust?]]>

Change in energy as light passes through air/water.]]>

F(x)=Po*A((Vo/Vo-A*x)-1)

where F would be the external force applied...

Calculating FvD for Hydraulic Cylinder with Air Bubble]]>

calculated G force and don't know what to do now (punch force)]]>

What does this differential "d" mean? Why say dE instead of E?

or...

Meaning of "d"?]]>

Practical scenario: NIR laser, black light marker and lamp.]]>

I have a few questions,...

Meaning of physical quantities and division]]>

Air conditioner vs evaporative cooler: ratio of (BTUs/hr) / electrical watts

I know evaporative coolers do not state BTUs/hr. I do not know why.

Did anyone try them and record time taken to cool.

I found this example, but I do not know if it is practically relevant:...

AC vs evaporative cooler: ratio of (BTUs/hr)/electric watts]]>

So like anyone who read about capillary action, you think about free energy generation, but as I read the problem is that the water won't leave the capillary tube on the other side because of the capillary action. So you need to use the capillary force from one end of the tube then...

capillary action]]>

I would imagine it would look like earth was speeding up but would there be any other physical effects on the aircraft?...

Question re. flying against Earth's rotation]]>

Do we live in a block universe?]]>

I have set up a simple scenario: A flat rectangle sheet falling down due to gravity. If I make the gravity...

Getting 'negative' force when calculating drag]]>

Crystal leaving patterns of the electromagnetic spectrum?]]>

the question is what is the source of the heat?

I considered the LED but that makes no sense.

Is it the motor...

Source of Heat in CD]]>

Can the Planck equation be derived by considering phonons?]]>

What is Voltage really?]]>

]]>

Antennas and electromagnetic radiation]]>

Given a velocity v = v0 this won't change. We have an electron running in a circle...

Radiation of an Electron]]>

(1) I read that the TEA Laser has high...

Class Making a T.E.A. Laser-- we have questions.]]>

For example, the concept of a vector representing a force is independent of what coordinate system is used to represent the vector. So is a "gradient vector" such a physical vector ?

The web page...

Coordinate independent version of "gradient"?]]>

Do the Relative Permittivity and Refractive Index of Water Match Up?]]>

How to calculate Drag Coefficient?]]>

Fire and combustion]]>

Why does an attraction force always have a negative sign?]]>

Regarding the wavevector spread.]]>

The problem:

A 3.60cm x 4.50cm rectangle lies in the xy-plane. What is the electric flux through the rectangle if E=(80.0i + 50k) N/C ?

My attempt:

First convert the rectangle units from cm to m.

4.50cm = 0.045m

3.60cm = 0.036m

Find the area of the rectangle.

A = 0.036m x 0.045m =...

Calculating the Electric FLux]]>

fermat's principle of least time]]>