Scientific Encyclopedia Exactroid

This is blog about physics and computer science. If you have a problem with your homework find informations there! If you don't understand anything or you want to ask, write a message (contact column). Our objective is to approach physics and explain physical phenomenons for everyone. Exactroid hopes that from now you will like physics nay in school. Remember: this awesome science is everywhere. :-) Physicists: EsdüxXor (founder, admin), Emily Do not miss anything! Copy and paste on your website this code: Want be a Exactroid member? Write (Submit column): Title - WRITTING FOR EXACTROID Include in Post : - YOUR (NICK)NAME - YOUR E-MAIL -URL OF YOUR TUMBLR BLOG Like our blog? Follow us!

[esduxxor]

So if you want to be programmer, you must read something about algorithms. And now we can start. Find and download Microsoft Visual Studio make new file C# Console Application. Now you can see this:

using System; using System.Collections.Generic; using System.Linq; using System.Text; using...

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Escape Velocities of satellites in solar system.

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Did you know that cigarettes are radioactive?

In addition to chemical, nonradioactive carcinogens, tobacco and tobacco smoke contain small amounts of lead-210(210Pb) and polonium-210 (210Po) both of which are radioactive carcinogens. The presence of polonium-210 in mainstream cigarette smoke has been experimentally measured at levels of 0.0263–0.036 pCi (0.97–1.33 mBq), which is equivalent to about 0.1 pCi per milligram of smoke (4 mBq/mg); or about 0.81 pCi of lead 210 per gram of dry condensed smoke (30 Bq/kg).

Research by NCAR radiochemist Ed Martell suggested that radioactive compounds in cigarette smoke are deposited in "hot spots" where bronchial tubes branch, that tar from cigarette smoke is resistant to dissolving in lung fluid and that radioactive compounds have a great deal of time to undergo radioactive decay before being cleared by natural processes. Indoors, these radioactive compounds can linger in secondhand smoke, and greater exposure would occur when these radioactive compounds are inhaled during normal breathing, which is deeper and longer than when inhaling cigarettes. Damage to the protective epithelial tissue from smoking only increases the prolonged retention of insoluble polonium 210 compounds produced from burning tobacco. Martell estimated that a carcinogenic radiation dose of 80–100 rads is delivered to the lung tissue of most smokers who die of lung cancer.

Smoking an average of 1.5 packs per day gives a radiation dose of 60-160 mSv/year, compared with living near a nuclear power station (0.0001 mSv/year) or the 3.0 mSv/year average dose for Americans. Some of the mineral apatite in Florida used to produce phosphate for U.S.A. tobacco crops contains uranium, radium, lead 210 and polonium 210 and radon. The radioactive smoke from tobacco fertilized this way is deposited in lungs and releases radiation even if a smoker quits the habit. The combination of carcinogenic tar and radiation in a sensitive organ such as lungs increases the risk of cancer. If the smoker also breathes in the asbestos fibers which commonly occur in urban and industrial environments, the risk of cancer is greatly increased. In contrast, a 1999 review of tobacco smoke carcinogens published in the Journal of the National Cancer Institute states that "levels of polonium-210 in tobacco smoke are not believed to be great enough to significantly impact lung cancer in smokers."

For example by Polonium 210 was killed Alexander Litvinenko agent of KGB.

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Special relativity

E = energy

m = weight

c = velocity of light

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NATO phonetic alphabet and HAM codes

A Alfa

B Bravo

C Charlie

D Delta

E Echo

F Foxtrot

G Golf

H Hotel

I India

J Juliet

K Kilo

L Lima

M Mike

N November

O Oscar

P Papa

Q Quebec

R Romeo

S Sierra

T Tango

U Uniform

V Victor

W Whiskey

X X-Ray

Y Yankee

Z Zulu

Most used HAM codes:

Morse aplhabet:

To practise try this: http://websdr.org/.

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Metric Prefixes by system SI

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Pressure

F = force

S = area

Pressure (symbol: P or p) is the ratio of force to the area over which that force is distributed. Pressure is force per unit area applied in a direction perpendicular to the surface of an object. Gauge pressure (also spelled gage pressure)[a] is the pressure relative to the local atmospheric or ambient pressure. Pressure is measured in any unit of force divided by any unit of area. The SI unit of pressure is the newton per square metre, which is called the pascal (Pa) after the seventeenth-century philosopher and scientist Blaise Pascal. A pressure of 1 Pa is small; it approximately equals the pressure exerted by a dollar bill resting flat on a table. Everyday pressures are often stated in kilopascals (1 kPa = 1000 Pa).

1 atmosphere = 101 325 Pascals

[exactroid]

Can vacuum toilet in airplane stuck you?

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Formula of angular frequency

omega = angular frequency vector (rad/s)

T = period (s)

f = frequency (Hz)

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Types of Radiation's formulas

Alpha

From the equation can be deduced that it is a bundle of speeding helium nuclei. Alpha radiation has the smallest frequency radiation, it's absorbed by sheet of paper.

** Beta Plus**

It consists of a stream of positrons, it's absorbted by the aluminum sheet.

** Beta Minus**

It consists of a stream of electrons, it's also absorbed by the aluminum sheet.

Gama

This is electromagnetic radiation, it's absorbed by a layer of lead.

Neutron radiation

Logical it consists of a stream of flying neutrons, it's absorbed by very thick layer of water or concrete.

[exactroid]

Computers of future - Intel’s 3D transistors!

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Ohm's law

Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points. Introducing the constant of proportionality, the resistance, one arrives at the usual mathematical equation that describes this relationship:

where I is the electric current, the electric conductivity G, U is the voltage and R is the electrical resistance.

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Well,

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