health-fun-with-physics

Physicists believe that our universe does not have three dimensions or four dimensions, but eleven dimensions (ten of space and one of time). We do not observe the extra spatial dimensions because they are curled tightly around each other.

The Ancient Greek philosopher Thales noticed that amber decorations on spinning wheels attracted threads, feathers, and other objects through what we now know to be static electricity. The Greek word for amber is elektron, from which William Gilbert, physician to Queen Elizabeth I, coined the word "electricity".

In 1903, Albert Michelson, one of the 19^th century's top physicists, commented "The more important fundamental laws and facts of physical science have all been discovered, and these are so firmly established that the possibility of their ever being supplemented in consequence of new discoveries is exceedingly remote". Two years later, Einstein published his revolutionary Theory of Special Relativity.

Einstein's ideas on relative acceleration were partly inspired by the free fall of a man who fell off a roof in Berlin. The man, who survived without injury, told Einstein that he had not felt the effects of gravity.

In 1905 Albert Einstein wrote his famous Special Theory of Relativity. It was published in a scientific journal that same year, but took many years to gain general acceptance. In fact, it was not verified by actual experiment until 25 years later. Two years after that paper was published, Einstein wanted a job as assistant professor of mathematics. This job required the applicant to submit a thesis paper, so Einstein submitted his Special Theory of Relativity. The university rejected it.

A "light year" is a measure of distance, not time. It is defined as the distance light travels in one year. Light moves at a velocity of about 300,000 kilometres each second, so in one year, it travels about 9,500,000,000,000 kilometres.

While light has no mass, it has weight. Weight is a measurement of the pull of gravity on something, and light can be bent by gravity.

The sky is blue because of refraction. The sun's light is of all colours of the rainbow, mixed together to make white light. The reds and yellows pass through air easily, but some of the blue portion of sunlight is scattered in every direction by air molecules. This scattering causes the sky to be blue.

It is not possible to hear in space. Because there is no atmosphere in space to conduct the sound, it would not carry. So, the object would make a noise, but it would not carry to any receiver, and no one would hear it.

Since the 1950s, physicists have discovered over 200 different kinds of particles.

The difference between the appearance of a real object and its reflection in a mirror is that the clockwise and counterclockwise directions are switched.

Newton's Third Law of Motion states that for every action there is an equal and opposite reaction.

When an airplane travels at a speed faster than sound, density waves of sound emitted by the plane accumulate in a cone behind the plane. When this shock wave passes, a listener hears a sonic boom.

It is not known exactly what gravity is. We can define what it is as a field of influence, and with general relativity we can define a language which states that it is a property of our real world that is mathematically equivalent to not just the geometry of space-time, but equivalent to space-time itself. Some think that it is made up of particles called gravitons, which flit about at the speed of light just as photons do. In any true fundamental sense, we do not know what gravity is, we only know how it operates in various corners of our universe. Without gravity, there would be no space and time.

Bell's Theorem states that certain measurements made on one particle can instantaneously affect the measurements made on a second particle that, in theory, could have been removed to the opposite side of the galaxy, with no physical connection between the two.

The size of Earth is roughly the geometric mean of the size of the universe and the size of an atom, and the mass of a human is roughly the geometric mean of the mass of Earth and the mass of the proton.

Did you know?

Looking for electricity facts for kids? Electric eels can shock their prey and predators with the use of electric stun ranging around 500 volts?

Water works against gravity. It can move up in a narrow tube through the process known as capillary action.

Of all known planets in the solar system, Uranus is the only one that revolves on its side, whilst the planet Venus is the only one that rotates in opposite direction to the Earth.

In order to enlarge particular figure, magnifying glass utilizes the convex shaped lens properties.

The energy we accumulate from the food we eat is measured in calories or joules.

The title of being the fastest land animal on earth goes to Cheetah, reaching the maximum speed of approximately 70mph.

Albert Einstein won the 1921 Nobel Prize for his work in theoretical physics field.

Friday, July 15, 2011