1. Measure the tested object's length at rest, the value l0.

2. Put this object in motion.

3. Measure the object's speed, the value v.

4....

How to test length contraction by experiment?]]>

Displays as:

\(\frac{-b\pm\sqrt{b^2-4ac}}{2a}\)

I wonder if someone who is good at LaTex could write a short tutorial of the basics, with some common SciForums examples? I'll write one up myself, but I'm a complete beginner at LaTex so it will take a little while.

In the meantime,...

Displaying equations using Tex]]>

This is approximately what Einstein wrote, which I think is very succinct and pretty much describes it.

When an individual ponders his experiences, he can order the events in his life using the criteria of **before** and **after**. He can assign a number to each event in such a way that events assigned...

Einstein view of time]]>

Can we change history so that the present and future will be changed too? ]]>

Let A = the probability that Player A will return the ball and B = the probability that Player B will return the ball. Then (1-A) = probability that A will miss and (1-B) = probability that B will miss.

It seems to me that the expected average rally length should be the sum of the counting numbers (1, 2, 3, ...) multiplied by...

How to calculate the expected average rally length in tennis]]>

I've got an idea of increasing the thrust output of a photon rocket through the use of a magnetic field.

If photons are "ripples" in the electromagnetic field, and magnets generate these photons through acceleration, if a photon rocket was accelerating, would the addition of these new photons make any appreciable difference to the overall thrust?

Has someone already done this?

Thanks in advance]]>

The surfaces are all flat and the pressure can equal that of the lids weight.

What would the lid do if the water boiled?

The pressure gets extremely more powerful for this example.

Would it

a) Not move

b) Move in one direction or another

c) move randomly based upon geometry and pressures.

d) Would the lid move straight along a linear left/right, forward/backward motion?

e) would...

How would steam pressure move a lid?]]>

ed: View attachment 2385

So the space of fractional linear transformations of the modular group (aka the Mobius group), obviously acts on this dual graph on the sphere. What I want to know is if I can rotate half the sphere about the octahedral (blue) lines, thus the projective plane will have one half transformed, the other fixed....

Symmetry of the cube]]>

This is the equivalent of calculating the average number of red balls drawn with replacement from a bag of red and green balls given the number of red...

Expected rally length in tennis]]>

Is infinity the largest number there is, or is it not a number at all?]]>

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As an offshoot of another thread about entropy, I offered an idea that cards could be "shuffled", yet still come out with an order to them. (I put shuffled in quotes because we weren't talking about a random shuffle).

As an example of it being plausible, I offered the idea that a magician (or was it a croupier?) claimed he could tell a card from its weight alone. The idea is that the more ink, the heavier the card, so Ace through 10 should...

Are playing cards sortable by weight?]]>

Length-contraction-magnetic-force between arbitrary currents]]>

Assume that matter and motion deform space. Characteristics of matter and motion are represented as “length scales”. The length scales are associated with mass, charge, and rotation. A ratio of length scale represents distortion. Deformation is represented as a ratio of incremental length. Assume...

Can each dimension of space be represented as a vector?]]>

Does time control everything in the universe?

Because every process must take time to happen.

Maybe time is GOD? ]]>