1

New Theories / Is this short story scientically correct?

« on: 16/03/2011 18:26:15 »

Lifting your computer from the floor onto the table gives you an advantage in an on-line computer game: You have a faster computer.

This faster computer draws more current from the wall socket. It uses more energy to flip a transistor one time, and the frequency of transistor flipping is higher.

What if the computer is a laptop running on battery? Whether the laptop is on the floor, or on the table, the same amount of computing can be done with the energy of the battery.

So, lifting a laptop must increase the energy of the laptop battery.

What if the laptop has purely optical circuits, and the "battery" of this laptop is a mirrored box filled with photons?

Well, obviously lifting this laptop must increase the energy of each photon.

2

Physics, Astronomy & Cosmology / Is this youtube videeo scientifically correct?

« on: 12/03/2011 11:31:04 »

Speeds that the rods reach are relativistic

http://www.youtube.com/watch?v=oqa3HYkg5no

3

Physics, Astronomy & Cosmology / Where does the remainder of the energy from a mass falling into a blackhole go?

« on: 26/12/2010 10:35:20 »

The experts say that when mass m is lowered into a black hole, that has mass M, then this is the energy of the mass m down at the event horizon:  E=Rmc^4 /8GM

This is the swarzschild radius of a black hole with mass M:
R=2GM/c²


Replacing R in first formula with 2GM/c² and simplifying we get: ¼mc²

So they say efficiency is 75%

BUT efficiency is actually 100%. As we can see when we build a heat engine where a black hole serves as a heat sink. This engine has 99.9999999 efficiency, or 99.999999999999999999999 with bigger and colder black hole.


Energy formula can be found here, about at the middle of the page.
http://www.scholarpedia.org/article/Bekenstein_bound
And here are some black hole efficiency considerations
http://kencroswell.com/BlackHolesInQuasarsSpinFast.html

4

Physics, Astronomy & Cosmology / How fast does photon spin?

« on: 15/12/2010 20:31:50 »

Let's radiate a frictionless black wheel with circularly polarized photons.

What is the wheel's spinning rate after very long time of circularly polarized photon radiation?

5

Physics, Astronomy & Cosmology / How does wave change?

« on: 21/11/2010 08:23:14 »

We have a standing sound wave in the air inside a closed pipe. We heat the pipe with a torch. Frequency of wave increases. Is this correct?

We have short pulse of sound wave in the air inside a closed pipe. We heat the pipe with a torch. Frequency of wave stays the same. Is this correct?

6

New Theories / Who wants to learn a new conservation law?

« on: 11/11/2010 05:00:04 »

If we have some mass in a closed box, it is not possible to the inertia of the box to change, also the weight of the box can not change. In other words inertial mass and gravitational mass are conserved. In other words mass is conserved.


(this "closed box" here is a "closed system", so it's much more closed than for example a closed safe )


Now that we know that mass is conserved, we know that mass does not change into energy, and energy does not
change into mass. We know that people who talk about mass changing into energy are confused, or uneducated, or they just haven't thought about it enough.

7

Physics, Astronomy & Cosmology / How does light catch up Bob?

« on: 31/10/2010 19:54:45 »

Let's say enemies have launched a killing beam of light at Bob, who is
receding at speed 0.999 c. Now the task of Bob is to maximize his "proper
time" alive. (A clock that is attached to Bob tells Bob's proper time)

Should Bob

a) increase his speed
b) decrease his speed
c) not change his speed
d) it makes no difference if he does a) or b) or c)

(it is not possible to dodge the beam, it's a wide beam)
 

8

Physics, Astronomy & Cosmology / Where does the energy go?

« on: 27/10/2010 23:43:07 »

When I am climbing a ladder in a gravity field, my chemical energy is turning  into potential energy.

When I am climbing a ladder in a accelerating rocket, what energy is my chemical energy turning  into?

9

Physics, Astronomy & Cosmology / Is flywheel a clock?

« on: 23/10/2010 08:45:40 »

I would like to know if I can apply the clock formulas of special relativity to flywheels?