Posts Tagged ‘matter’

Matter, Antimatter and Einstein’s equation

It is my understanding that when antimatter comes in contact with matter that there is nothing left but pure energy. And since energy and matter are interchangeable (E=Mc2) doesn’t that mean you are actually left with all matter and no antimatter...

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Ideas on the Origin of Universe

Well, nobody knows it exactly. Physics and other sciences can explain How things go or went, not Why. Althought there is a theory, called the M theory or the 11 dimensions theory, that gives a kind of answer to this: the M theory says that the matter is made of little strings that vibrating give [...]

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Question from Thermal Properties of matter

A clock has a pendulum made of brass . The clock record time correctly at 20 degree C. If temp is increased by 10 degree C, the clock will gain or lose time and by how much??? (Shubham Chauhan posted this question) Incoming search terms:properties of m...

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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 g...@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 [...]

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Third Term Unit Test sample question paper for Class XI CBSE

A Sample test for Third term for Class XI Physics.

This test covers the chapters

• Properties of Fluids
• Thermal Properties of matter
• Thermodynamics

The pattern of the question paper is

• 5 x 1 mark = 5 marks
• 5 x 2 marks = 10 marks
• 5 x 3 marks = 15 marks
• 2 x 5 marks = 10 marks
• TOTAL = 40 marks

Click the Link to Download III term UT-physics

Revision questions for class XI

Motion & Laws of motion

PROPERTIES OF MATTER

work rotation gravitation

HEAT OSCILLATIONS WAVES

Transcript of my chat with a student on DARK MATTER

Mani is online.

hi sir..gud aftrnun

hello

sir..hav u heard of dark matter?

ya

itz said dat its present evrywher in d universe…does it possess mass?

Not Everywhere, Darkmatter is matter which is not seen because they donot emit or reflect any detectable radiations or matter. Their presence is felt by gravity. Just like a blind find that things are there by feeling it. It possesses mass and that is how it is felt

bt its nt made of atoms..so hw can it b influencd by gravity??

Whatever be the elementary constituents, if there is matter there is gravity. Matter which cannot be detected, it may either be 100% absorbent or 100% transparent.

in either case, its presence is not "seen"

it constitutes about 90% of all substances in d universe..so it shud possibly b present everywer..even in our body..

If you find any discrepancy between your observed mass and felt mass (inertia) then there is a possibility

bt d felt mass cant b measured though..sir..so if dark matter is present..den the mass of every object is subjectd to vary..right?

darkmatter is not "seen" because of the absence of any radiation from it. It has gravity

yes..bt since it has mass..it wud add up to the mass of the matter in wich it is present..

By the way who said 90%? http://upload.wikimedia.org/wikipedia/commons/a/a5/080998_Universe_Content_240.jpg

It is not an easy task to explain everything via simple text chat. I recommend you go through the  following links to understand dark matter and dark energy better.

http://en.wikipedia.org/wiki/Dark_energy

http://science.nasa.gov/astrophysics/focus-areas/what-is-dark-energy/

http://imagine.gsfc.nasa.gov/docs/science/mysteries_l1/dark_energy.html

http://physicsworld.com/cws/article/print/19419

http://hubblesite.org/hubble_discoveries/dark_energy/