Skip to main content

WHY EARTH SPINS?

 

  •         Earth is rotating on its axis about 1673 km/h.
  •         Why do earth spin? is an age old question. Not only earth , everything in the universe spin.
  •         And the common answer for such questions is inertia – the ability to resist change in motion.
  •         But now, let's think deep into it.
  •        To answer this we have to go to the beginning, about 4.5billion years ago.
  •         In our old blog Nebula, we saw how the stars are formed.
  •         4.5 billion years ago our solar system was formed from a nebula.
  •          In that nebula as usual when hydrogen and helium atoms contracted and expanded, the nebula stated to rotate with an angular momentum. As the process goes on also, the direction of spin didn’t change.
  •         After sometimes sun, planets, asteroids are formed out of the nebula.
  •         To conserve the angular momentum, all the objects formed from the nebula had spin.
  •         The angular momentum of the plants are not constant, it is decreasing.  After some millions of years, one day will have less than 24 hours.
  •         Almost all the planets spin in anticlockwise direction, but Venus is an exemption.
  •         Venus spin in clockwise direction. It may be because some object may hit it and its spin axis direction may changed. Or its spin angular momentum would have became zero and started to spin in opposite direction.
  •        Uranus also have clockwise spin, because it was knocked on its side.

Comments

Post a Comment

Popular posts from this blog

BLACK BODY RADIATION

         As we already saw in our blog ‘How do we see colors’, “It’s the material, Not the color! – how do we see color?”, black body is an ideal object.          Black body is an object that can absorbs all frequencies of radiation.          Due to this the object get heated up and when its temperature equals to the surrounding temperature, the object starts to radiate energy in the form of electromagnetic radiation .         Depending upon the temperature of the body the intensity of the radiation of different frequency varies.          Almost all the object behave like an black body (but not like an ideal one), example: sun, human body, hot objects …          In 18 th century when scientist thought that they found almost everything in the field of physics, black body concept came as a challenge in front of them.        ...
Post a Comment
Read more

Imaginary Number's - 'i'

Classification of numbers: Numbers came into existence because of the need of counts.   We encounter the numbers or use them in our day to day lives.   Numbers are broadly classified into real numbers and imaginary numbers .  We commonly use the real numbers in our day to day life whereas we are not much familiar with the imaginary numbers. But imaginary numbers also have an integral part to play with, when it comes to quadratic equations, technology, electricity, etc., Significance of 'i': Imaginary numbers are usually represented by 'i' Imaginary numbers are NOT imaginary. They exists and has it's own applications. Euler gave the symbol 'i' for roots of negative numbers. When we take the roots of negative numbers, we get an error reply.  So to get the result of negative roots, the real numbers are multiplied by 'i' =   √-1   Where 'i' is the 90 degree rotation to the real number axis. Since 'i' has the property of oscillatory...
Post a Comment
Read more

Dr. C.V. Raman – The Man Behind National Science Day

In 1930, a common man made the Indian scientific society proud by bagging the first Nobel prize for physics. The man who decoded the color of sky and sea, and changed the people’s perspective on spectroscopy, he is none other than Dr. C.V. Raman. Young days: In a small city Tiruchirppalli, Tamil Nadu on, 7 November 1888, Parvathi Ammal gave birth to a son who revolutionized the field of acoustics and optics. As a son of a lecturer in mathematics and physics, he manifested a brilliant mind in his childhood. Education: Raman’s passion towards studies, led him to accomplish his schooling at a very young age of 11.  He moved to Chennai in 1903, to pursue a bachelor’s degree in Physics at Presidency college, Madras University.  In 1906, he published his first research paper on diffraction of light as a graduate student. Achieving a gold medal, he then completed his masters in the same university. A bolt from the blue: In 1907, due to his father’s insistence he joined the Indian Fin...
2 comments
Read more