An international collaboration of scientists has recorded the most accurate confirmation to date for one of the cornerstones of Einstein's theory of general relativity, 'the universality of free fall."

The new research shows that the theory holds for strongly self-gravitating objects such as neutron stars. Using a radio telescope, scientists can very accurately observe the signal produced by...

Astrophysicists confirm cornerstone of Einstein's Theory of Relativity [again!]]]>

Is it as difficult as Finite Element Method?]]>

The universe, as seen through the lens of quantum mechanics, is a noisy, crackling space where particles blink constantly in and out of existence, creating a layer of background quantum noise whose effects are normally far too subtle to detect in everyday objects.

Now for the first time, a team led by researchers at MIT...

Measuring Quantum Fluctuations on the Human scale:]]>

Personally, I've always thought (purely for philosophical reasons) that the answer is "yes": his conclusion about her current age IS "meaningful", "real", and "true". I base that on...

A Possible Proof that Simultaneity at a Distance is Meaningless]]>

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]]>

Janus' method for non-linear velocity addition]]>

1.000 ... 1.000

0.800 ... 1.250

0.625 ... 1.600

0.500 ... 2.000

Are there others? Proof / disproof?]]>

Here I'm saying time dilation is caused by the geometry of spacetime. Could be any of the above.

The assumptions are flat spacetime, no accelerations, no tricks and the simplest possible notation.

The general idea is that the spacetime interval (I'm calling it 's') is the same in every frame - you might call it the invariant...

Invariant spacetime and time dilation]]>

The train driver measures the time interval between the first station passing his window and the second station passing his window.

The train driver compares the time he measures with the interval shown on the station clocks which are synchronised in the station frame.

The train driver finds that his elapsed time is less than the interval indicated by the station clocks by an amount we have...

Travelling back down a train - relatively speaking.]]>

However, quark can be converted to energy, right?

In nuclear fission (The collision caused the larger isotope to break apart into two or more elements, which is called

What is quark?]]>

Let B be the event the first is a girl

Let C be the event the next 3 are boys

P(B U C)=P(B)+P(C)-P(B intersect C)

=1/2 + (1/2)^3 - 1/16

=9/16 or 0.5625<--but the answer...

More probability questions]]>

My questuon is:

If one person on earth, one person on satellite, both measure the ticking of the clocks,

does 1 second duration appear the same relatively to each of them?

If same, why you say the clock on satellite is slower?]]>

Alex]]>

The latest AMD cpu zen3 is 7nm, while Intel cpu mostly still at 14nm.]]>

Photon is massless, how does it carry heat energy with it to travel so far?]]>

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?]]>