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If I add sugar to the coffee cools faster? Why

Some 'time ago I was asked this question. Someone argued that adding sugar to coffee vending machines, beverage to cool faster.

To answer your question, pull ball in the 2nd law of thermodynamics and take into consideration the coffee-sugar.

Coffee has a temperature close to boiling water, its main component.

sugar instead is delivered to almost room temperature.

The system tends to reach a temperature equilibrium, whereby the first component, the coffee will tend to cool, while the second, the sugar will tend to heat up.

The temperature difference between the two quantities and items are so marked, however, that the sugar in a hurry to reach the solubility and melt in a few seconds, while coffee will cool down in an imperceptible way.

The result is that coffee does not cool down in practice, if not a minor.

The belief that the coffee cools date is probably the fact that in order to melt sugar many times you turn the coffee. This makes the drink more time to remain in contact with the surface of the glass, but most of the spoon air, compared to a bitter coffee, which is usually drunk in less time.

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TV in the wheels of cars at a certain speed run in reverse? Immortalized

You will have often seen on television, in commercials or programs of electric motors, and speed the wheels of the cars seem to run counter to the run, tires car racing resumed even under braking, turning in the opposite direction and then at some point, slow down, turn in the right direction.
If you've wondered why this happens, here's the answer.

What you see is just an optical illusion.

first start by saying that our brain recognizes a moving image when it is put in sequence at least 10 frames per second. The movies are recorded at the cinema by combining 24 frames per second, on TV, however, between 50 and 160 frames per second.

If the speed of rotation of a wheel was identical to the speed with which the camera records the image, each frame would have turned the wheel a full turn and our brain seems to be motionless.

This does not happen at every frame and the camera records the rotation of the spins of a number of degrees.

When the car's speed increases, the speed of rotation increases. We shall turn the wheel forward until between one frame and the other has made this shift around its minor axis to 270 ° (3 / 4 turn)

To simplify we take as reference the hands of a clock: if the first frame of the tire of a point P ' Car is located at 12.00 and the second frame is at 12:44 or not, we will see him turn in a clockwise direction.

When, however, between one frame and the other is reached and exceeded the critical threshold of 270 °, the brain calculates the shortest move, then felt a shift in contrast to less than 90 °.

always taking as an example the clock, when the point P in the first frame of the tire is in second at 12.00 and 12:45 or more, the brain will ignore the shift time of 45 minutes, but it will perceive a shift of 15 minutes counterclockwise. We will then see the tire spin in reverse.

This is called "apparent motion"

To summarize, we see the wheels turn a car in the correct direction until a critical speed is reached, beyond which we will turn instead to the contrary. When the car slows down, for example to take a corner, we'll see the wheels turning on the contrary more and more slowly until, dropped below the critical speed, will return to run in the correct direction.

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a galaxy "invisible" Lunar eclipse tonight

The NASA Swift satellite has captured a galaxy that the human eye can not see. For the "what we see does not mean that there is"

fact

photos were taken in the ultraviolet, the field that the human eye can not perceive.

the M33, it has been called, is a galaxy that is part of the location of the Milky Way and the Andromeda galaxy. E 'distant 2.9 million miles from Earth, has a diameter of about 50 thousand light years and has a mass equal to one tenth of our galaxy.

The images, consisting of 34 frames taken in 11 hours of exposure, show a large amount of star formation and allow to perform studies would not have been possible.

For further information please consult the website of NASA http://www.nasa.gov/

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From "Il Corriere della Sera

will be an eclipse of the Moon of insomniacs, that of the night between Wednesday 20 and Thursday, February 21. Spectacular total eclipse, during which you can see the white disc of the full moon darken slowly swallowed by the shadow of the Earth.

As is the case for years, during major astronomical events, Corriere.it will connect with an Italian amateur telescope Union (IAU) to offer its readers the spectacle of the Red Moon, so that the color it usually takes our satellite as they rode in the shadows. The direct on Corriere.it will start in the early hours of Wednesday 21, about an hour and a half hours after midnight, when the Moon will enter in the shadows. But only after 02.42 at the time of first contact with the shadow, you can appreciate the obvious reduction of the lunar disk. The phase of totality, that is complete obscuration of the moon will last just under an hour, from 04 at 04.51. Then, until the early hours of the day, who will resist falling asleep can watch the gradual return of the condition of the full moon. To give a touch of originality to the problem, there is the apparent approach of the star Regulus (the brightest of the constellation Leo) to the lunar disc, a little 'shine the most distant planet Saturn. E 'expected to follow the event is the telescope of the observatory located UAI-Skylive Pedara, Etna. But, in case of bad local weather conditions, will come into operation other astronomical positions.

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discovered a new species of mammal

latest issue of "The Journal of Zoology "published an article on the discovery of a new species of elephant shrew or Sengis, called Rhynchocyon udzungwensis.

What is much less trivial than you might think, although it is now generally accepted that there are many animal species are still unknown, the discovery of a mammal it is rather difficult. Only among the insects, in fact, there are about 900,000 species of mammals against 4500, numbers that give an idea of \u200b\u200bthe different probabilities and to discover a new species in the two classes .

Also it is not just a shrew, but a shrew elephant, named for the trunk of which is equipped. The special feature is its taxonomic status, or in simple words, its position in the family tree of mammals. The Sengis fact belongs to the superorder Afrotheria, which also includes Proboscidea, the elephants that his trunk is therefore not a simple analogy, but it is a sign of kinship with large pachyderms.

Compared to a common shrew, around 7 cm long and weighing 12 g, Sengis this is a giant: it measures 30 cm in length and weighs around 700 g. He lives in the forests of Tanzania and like other shrews feed on insects.

Lastly that the discovery was made, among others, by an Italian, Francesco Rovero of the Trento Museum of Natural Science.

For info:

http://www.blackwell-synergy.com/doi/abs/10.1111/j.1469-7998.2007.00363.x

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The Hubble Space Telescope


Surfing the net I came across this beautiful image of the galaxy M104 and I took the opportunity to start in February with a nice post on the space telescope.

Hubble is 13.2 m long, heavy 11 tons, has a diameter of 4.2 m and is placed in orbit around the Earth at a height of 600 km, beyond the atmosphere. Its location allows to get sharp images, high resolution, without the distortion typical of the atmosphere requires telescopes on the ground. It 'was launched in 1990 as a joint project between NASA and ESA, the European Space Agency. According to Hubble's original plans every three years would have to return to Earth for a review, but the fear of physical damage they did abandon this path and you opted for direct intervention in orbit. The first images that came to us in '90 shocker .. they were horrible! It was understood later that it was hastily assembled to a mirror or error built without taking into account the refraction of light in vacuum, except that air rather than the right one was left on the ground. At first the maintenance of optical Hubble was correct and the desired quality finally restored. In 2007, Hubble has been idle for a failure, but glancing at the official site seems to have returned to full efficiency. In September 2008, will be the subject of further maintenance, which will affect gyros, batteries, in fact the heart of the telescope.
Hubble telescope is not a simple, but incorporates different instruments: two spettografi, an infrared camera, one for the faint objects and others over the years have been replaced or upgraded.

Hubble in fact proved that there are planets around other stars in the universe, has witnessed the collision of Comet Shoemaker-Levy 9 and Jupiter, and gave receipts on current theories of universe expansion and holes blacks.

This observer space will not be alone for much longer: in 2013 it is expected the launch of the Webb telescope will have a greater capacity most powerful infrared survey will be placed in orbit at 1.5 million km from Earth in the direction away from the Sun

the images and other info can be found at:

http://hubblesite.org/

Good Vision