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Resistance and Resistivity

Simran Asked

“Two wires A and B of equal lengths,different cross-sectional areas and made of same metal a)name the property which is same for both the wires. b)name the property which is different for both the wires”

Answer:

Since both the wires are of same metal, the resistivity will be same for both whereas since the dimensions (Area of cross section here) are different, the resistance will be different

Gravity and something more

Jihin Asked:

Some Things That I Have Always Wondered OF : (i hope it may be answered soon …)
1)is it possible that our human body can withstand pressures twice or more than the atmospheric pressure without a suite or is there any artificial instruments or means in which our heart can be made to pump into a level in which we can attain this ability !!!
2)when more gravity  is experienced , it is said that time travels slowly – is it  relative ??? caz time goes at a constant rate !!! it is only the position or view that makes the observer feel the situations ???
3) Is there any gravity chambers successfully made out … in which the gravity can be changed accordingly to observe diff. phenomena ??? Cant It be possible to do that ????

Ans:

To be posted soon.

However, I agree that I may not be able to give you a satisfying answer to all your queries, as “Science says the first word of everything and the last word of nothing.” We are learning new things everyday. When we explore more and more, we find that we know less and less and our knowledge is too meagre.

By the time I prepare a well fitting answer to this, visitors are also requested to respond to the question by posting answers and comments.

Physics.org Award winning websites

http://scienceblogs.com/startswithabang/

http://www.zooniverse.org/

http://www.popsci.com/

http://www.cosmosmagazine.com/

http://www.guardian.co.uk/science/series/science

http://www.physicsforums.com/

http://www.last-word.com/index.php

http://www.nasa.gov/audience/forkids/kidsclub/flash/index.html

https://project-cernland.web.cern.ch/project-CERNland/index.html

http://www.physics.org/

http://www.sciencefairstl.org/

Amateur Research

Ask Physics is looking for students from Kendriya Vidyalayas of Kerala who are interested in doing Research in any branch of Science.

If interested, Use the link below to express your interest.

You will be contacted by the concerned official.

Click Here to express your interest.

BP, cardiac arrest and Physics

Ashlin asks:

  1. HOW IS CARDIAC ARREST RELATED WITH PHSICS?
  2. WHAT IS THE PRINCIPLE OF SPHYGMOMANOMETER?

Devika asks:

Why the blood pressure in humans is greater at the feet than at the brain.

Optics

Rajat asked:

“when we exchange the lenses of compound microscope, then why it does not act as a telescope?”

Defy gravity

Athira asked:

HOW FAST  WOULD THE EARTH HAVE TO ROTATE SO THAT IT WOULD NEUTRALIZE GRAVITY?

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