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Showing posts with label Objective Questions Science and Technology. Show all posts
Showing posts with label Objective Questions Science and Technology. Show all posts

Monday 23 May 2016

Swadeshi Space Shuttle Tests, ISRO's 'Mission Accomplished': 10 Facts

Swadeshi Space Shuttle Tests, ISRO's 'Mission Accomplished': 10 Facts

  • The 6.5 metre-long scale model of the re-usable launch vehicle weighs about 1.75 tonnes and was made at a cost of Rs. 95 crore. It was built at the Vikram Sarabhai Space Centre in Thiruvananthapuram by a team of 600 scientists over five years.
  • Re-usable technology aims to help reduce the cost of launching objects into space by 10 times. It costs about $ 20,000 to send a kilogram in space currently.
  • Indian Space Research Organization or ISRO plans to test two more such prototypes before the final version which will be about six times larger at around 40 metres and will take off around 2030.
  • After the test flight was declared successful, Prime Minister Narendra Modi congratulated scientists at ISRO and tweeted: “Launch of India's first indigenous space shuttle RLV-TD is the result of the industrious efforts of our scientists. Congrats to them.”
  • The spacecraft was launched atop a nine-ton rocket engine that has been designed to burn slowly

Friday 8 January 2016

Why isn't there a gravitational pull on fire? Flat 40% OFF-www.KiranBookStore.com

Why isn't there a gravitational pull on fire? Flat 40% OFF-www.KiranBookStore.com

why-isnt-there-gravitational-pull-on-FIRE-www.KiranBookStore.com

Carry  a helium or hydrogen filled balloon in a car, and accelerate the car. (Be careful; this can be dangerous.) The balloon will not be pulled to the rear of the car; it will move to the front! (That's why I said you have to be careful.)
The balloon is, of course, pushed backwards by the acceleration (according to the equivalence principle, this is equivalent to rearward gravity), but the air, since it weighs more per volume, is pushed more. So it is what goes backwards, while the balloon is forced forward by the heavier flowing air.
Likewise from gravity. A balloon goes up because the heavier air falls down around it, displacing the balloon. And similarly for the hot plasma known as fire. It weighs less per cubic centimeter than does the air around it, so the air drops and pushes the plasma up.


When you start a fire, fuel combines with oxygen to release heat, light, carbon dioxide, water vapor, soot etc. The heat energy generated in this process heats up the air around the flame which in turn decrease the density of the surrounding air.

This hot air around the flame then starts rising up and the surrounding colder heavier air rushes down into its place accelerating the hot air upwards which in turn causes the flame to shoot up. It is this hot air rushing upwards that also causes fire to flicker.
In case of in a micro gravity environment, there is no reason for the heavier air to fall down and rush into the place of the lighter air. So the flame just remains a spherical blob as you would imagine. 

Thus, gravitational pull exist on fire too.

Thursday 7 January 2016

Periodic-Tables-7th-Period-is-Finally-Complete-IUPAC-Officials-Say

Periodic Table’s 7th Period is Finally Complete, IUPAC-IUPAP Officials Say

Periodic-Tables-7th-Period-is-Finally-Complete-IUPAC-Officials-Say

The 7th period of the periodic table now has four new elements: element 113 (temporarily named as Ununtrium, or Uut)element 115 (Ununpentium, or Uup)element 117 (Ununseptium, or Uus), and element 118 (Ununoctium, or Uuo), says a group of experts from the International Union of Pure and Applied Chemistry (IUPAC) and the International Union of Pure and Applied Physics (IUPAP).

Acche Din Heavy Discount

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