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Monthly Archives: July 2011

Big Bang Theory

‘BIG BANG’ theory is well known to all . If it actually happened, Then I thought a question about this, like as what is the actual position of our earth in the previous time of ‘BIG BANG’?? When the whole earth is like a point. … Arkajyoti asked

A Question on Evaporation

Arunabh Arun sent this problem.

(Click on the image to see the enlarged version.)

Google Guru – A Great Help on the move

Have you heard of Google guru?

Users of Google Talk can now get answers to their questions by adding guru@googlelabs.com as their friend on Google talk.

After adding as friend, you can just chat with guru and ask any question on chat. The answers will appear as reply almost instantly.

If you type Weather Trivandrum, a brief report on Trivandrum’s  weather (yesterday, today and tomorrow) will a[ppear as reply.

See what I got when I queried Weather Trivandrum

Weather:
Trivandrum, Kerala, India
27°C, Haze
Wind: W 19 km/h
Hum: 79%
Wed: 24°C-30°C, Chance of Rain
Thu: 25°C-30°C, Chance of Storm
Fri: 25°C-30°C, Partly Sunny

The best part is that Google Guru gives the correct answer even if there  are some mistakes in spelling.

See what I got when I typed

Define khemistry

guru: Did you mean ‘web CHEMISTRY’?

Web:
* Chemistry – Wikipedia, the free encyclopedia
en.wikipedia.org
Chemistry (the etymology of the word has been much disputed) is the science of matter and the changes it undergoes. The science of matter is also addressed …

View all results:
http://m.google.com/u/_y0CPP

Make a try now, It helps and is superfast

 

Why Radiant energy is quantized?

Kiran Asks: “why energy is radiated or abosrbed in quanta in terms of natural numbers i.e. nhv where n=1,2,3… but not fractional i.e. 1/2 hv or 3/2 hv”

Any Answer dear members and students?

 

How to describe momentum physically ?

Kiran asks: “How do you describe momentum physically by not in definitions like product of mass and velocity?”

Answer: Momentum is defined as “Mass in Motion” or “The quantity of motion“. Momentum is a measure of the “effect” a moving body can produce. It is a measure of the “effort” required to bring a body to its present state of motion from rest OR the effort required to stop a body from its present state of motion.

Since the effect produced by a moving body depends on “How much” and “How Fast“, momentum is taken as the product of mass and velocity. (P=mv). Momentum is a vector quantity and its direction is same as that of velocity.

Want to know more? Please refer to the following links

Idea on origin of Gravity – A discussion

Derek shares his idea on origin of Gravity – “if you were to suddenly put a large object in space then the space would  be pushed out to the sides (displacement) . because the object  is now in the place were space once  occupied ?? so space is just pushing  back to its original area ???? is this what gravity is??? or bending of space?”

(Here are some related links suggested for exploring further –

  1. http://ag-physics.org/gravity/
  2. http://www.keshefoundation.com/overview.html
  3. http://www.regenerating-universe.org/13)_What_is_Gravity.htm
  4. http://theoryofeverything.co.uk/
  5. http://badphysics.wordpress.com/2010/01/11/%E2%80%9Con-the-origin-of-gravity-and-the-laws-of-newton%E2%80%9D-by-erik-verlinde/

you are given two nichrome wire of same length and different thickness Which wire will get heated first Give reason.?

You are given two nichrome wire of same length and different thickness Which wire will get heated first Give reason.? Asked Merlin Mary Mathew

Answer:

If the wires are connected one by one to a source, (or connected in parallel to the same source) the one having less resistance (Greater thickness) will get heated up first. This is because, for constant voltage, Heat dissipated is inversely proportional to resistance.

If both are connected in series to a power supply, the one with less thickness will get heated up as same current is flowing through both and then heat generated is directly proportional to resistance.

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