In the eve of this newyear,we are announcing a juicy and irrestible offer…… read international quality Physics textbooks /notes for FREE ! All you have to do,is to go to the required webpage and download the books of your choice.Some of the notable titles are  :

• 21st Century Physics Flexbook                                                          
• A Course in Graduate Electrodynamics
• Radically Modern Approach to Introductory Physics            
• A Simple Introduction to Particle Physics                                    
• Applications of Classical Physics       CALTECH,                          
• Chemical Thermodynamics                                                                  
• Computational Nanoscience: Do It Yourself!
• Computational Physics,  Oslo University                                          
• Conceptual Physics
• Electromagnetic Field Theory
• Electromagnetic Field Theory: A Problem Solving Approach , MIT
• Encyclopedia of Astrophysics                                                             
• Fundamentals of Thermodynamics                                                   
• Nanotechnology                                                                                       
• Optics  , Oxford University 
• Review of Particle Physics 2008  , Elsevier publ.

We would like to recieve feedbacks from the users regarding the above….. also ,do inform us whether you are interested in freebies of the same kind. Link   :        http://www.e-booksdirectory.com/physics.php

All work and no play is neither good for your body nor your brain…so goes the saying.When dabbling with serious physics, a little fun related to the same ,we feel, would be a welcome addition.Here’s a simple game dealing with mechanics and projectile motion.Don’t forget to check out the bouncing music !

mr.bounce

Go for the game         http://pixelate.de/games/mr-bounce

Continuing with our discussion on Bernoulli’s theorem, we take a look at some of the previous questions asked in the Physics paper of IIT-JEE dealing with the same.We would also be trying to find a pattern in the theoretical aspects of the said questions. [ Answers in the next post dealing with Bernoulli's theorem ]

*1] Water from a tap emerges vertically downwards with an initial speed of 1.0m/s.The cross sectional area of tap is .Assume that the pressure is constant throughout the stream of water and that the flow is steady.The cross-sectional area of stream 0.15m below the tap is..  [ IIT-JEE 1998 ] 

*2] A glass tube of uniform internal radius [ r ] has a valve separating the two identical ends.Initially,the valve is in a tightly closed position.End 1 has a hemispherical soap bubble of radius r.End 2 has sub-hemispherical soap bubble as shown.What happens after opening the valve ?  [ IIT-JEE 2008 ] 

*3 ] A non-viscous liquid of constant density 1000 kg/flows in stream line motion along a tube of variable cross-section.The tube is kept inclined in the vertical plain as shown.The area of cross-section of the tube at two points P and Q at heights of 2m and 5m are respectively 4x and 8 x .Find the work done per unit volume by the pressure and the gravity forces as the fluid flows from point P t0 Q.  [ IIT-JEE 1997 ] 

*4 ] A liquid of density 9ookg/is filled in a cylindrical tank of upper radius 0.9m and lower radius 0.3m.A capillary tube of length l is attached at the bottom of the tank as shown.The capillary has outer radius 0.002m and inner radius a.When pressure p is applied at the top of the tank volume,flow rate of the liquid is 8x/s and if capillary tube is detached,the liquid comes out from the tank with a velocity 10m/s.Determine the coefficient of viscosity of the liquid ?        [ IIT-JEE 2003 ] 

ques.no.2

ques.no.3

ques.no.4

Dear Readers,

We are excited to announce two new posts to be published shortly………..Get to see the fully solved papers of the Physics section of IIT-JEE 2009.In addition,get to know the techniques needed to solve almost any physics problem..irrespective of whether it’s a school level question or that belonging to the Physics Olympiad.

INFINITE PHYSICS

If the resultant of all the external forces acting on a system of particles is zero, then from an inertial frame,one can surely say that

A] linear momentum of the system does not change in time

B] kinetic energy of the system does not change in time

C] angular momentum of the system does not change in time

Given below is the answer to Optics question from IIT-JEE Physics paper 2009

V is taken by calculating the root of  2 x 10 x [ 20 - 12.8 ] which gives  12 m/s…. now,

Considering  the diffraction at the water surface,

v/u2  = u/u1  or  dv/dt  = u2/u1 x dv/dt     i.e,  dv/dt  = 4/3 x 12 = 16 m/s.

Hence,option C is correct.

4/3 is the refractive index

The GOI HRD Minister,Kapil Sibal has mooted the idea that aspiring IIT candidates must get a  gross percentage of atleast 80% in their class XII board exams,if they are to be eligible for the IIT-JEE Exam.If fact,the idea is not a bolt from the blue,as such,as it was in the consideration of a team comprising of IIT Directors,who were constituted to look into IIT-JEE Exam reforms.The main reason for this approach stems from the oft repeated quote,that the exam was being hijacked by the numerous coaching centres,which in turn forced the aspiring students to make a beeline to their classes,thereby diluting their attention for their board exams.  IIT-Delhi professor M Balakrishnan said” ’This proposal has been mooted for almost a year now. There is talk in the ministry and among IITs to take such a decision soon.”

We at Physicsmynd feel quite ambivalent at the idea as our core motto is in aiding the students to learn Physics in it’s most throuogh & enjoyable  manner,without as such having a diversification as that meant for an entrance exam or board exams.However,we feel that the students,tutors & parents ought to be sensitized about the issue,before actually implementing it. 

Stop Press : Kapil sibal has now taken a U turn,stating that it’s the IIT’s which have to decide. 

Kapil Sibal,Union HRD Minister

Given below is a list of the top engineering institutes in India.Eventhough,they are mostly based on media group surveys like those conducted by India Today/Outlook/ORG-MARG/EFY-Mint,some recently started public sector colleges are also added,based on our own internal audit,taking into account their faculty as well as their upcoming infrastructure.We feel that such a fresh criteria would be benefecial in the long term,as one of the main intentions of such lists is to aid the prospective students in selecting colleges which would provide them quality engineering education.

• IIT Kanpur                http://www.iitk.ac.in/
• IIT Kharagpur       http://www.iitkgp.ac.in/
• IIT Delhi                   http://www.iitd.ac.in/
• IIT Mumbai               http://www.iitb.ac.in/
• IIT Chennai               http://www.iitm.ac.in/
• IIT Rourkee               http://www.iitr.ac.in/
• BITS,Pilani                 http://www.bits-pilani.ac.in/
• IIT Gawhati               http://www.iitg.ernet.in/
• IT,BHU                        http://www.itbhu.ac.in/
• CET,Anna University     http://www.annauniv.edu/
• ISM,Dhanbad          http://www.ismdhanbad.ac.in/
• BIT,Mesra                http://www.bitmesra.ac.in/
• NIT,Warangal         http://www.nitw.ac.in/nitwnew/index.aspx
• Jadavpur University  http://www.jadavpur.edu/
• NIT,Trichy              http://www.nitt.edu/home/
• CET,Delhi                http://www.dce.edu/
• PEC,Chandigarh   http://www.pec.ac.in/
• NIT,Suatkal         http://www.nitk.ac.in/
• Motilal NIT           http://www.mnnit.ac.in/
• Thapar IST          http://tiet.ac.in/
• MNIT,Jaipur        http://www.mnit.ac.in/

[This list is by no means an exhaustive one and is meant for basic info.The interesting feature,is the upcoming of speacilized insitutes offering exclusive streams……..

• Indian Institute of Space Science & Tech      http://www.iist.ac.in/IIST/
• Indian Institute of Information Tech,Bangalore http://www.iiitb.ac.in/
• IIIT Hyderabad                                                       http://www.iiit.net/
• IIIT,Allahabad                                                        http://www.iiita.ac.in/
• IISER,Kolkata,Pune,Mohali,Chandigarh,Bhopal,Trivandrum.

We introduce a new, interesting as well as stimulating section in Physicsmynd.. Physics Musings..this section dwells on everyday occurences and the physics involved in it.More than an interesting read,this section is meant to develop the intuitive theoritical abilities of a physics student,a necessary quality a student ought to have,especially in a tough,nerve wracking examination like the IIT-JEE.

In the first post,we discuss about the physics behind the scintillating acrobatics seen in air shows.

The extra-ordinary air acrobatics is based on the physical principle first elucidated by Bernoulli…the theorem  is an idealized algebraic  relation between pressure, velocity, and elevation for flow of an inviscid fluid. Its most commonly used form is for steady flow of an incompressible fluid, and is given by the equation below, where p is pressure, ρ is fluid density (assumed constant), V is flow velocity, g is the acceleration of gravity, and z is the elevation of the fluid particle. The relation applies along any particular streamline of the flow. The constant may vary across streamlines unless it can be further shown that the fluid has zero local angular velocity. The above equation may be extended to steady compressible flow (where changes in ρ are important) by adding the internal energy per unit mass, e, to the left-hand side. The equation is limited to inviscid flows with no heat transfer, shaft work, or shear work. Although no real fluid truly meets these conditions, the relation is quite accurate in free-flow or “core” regions away from solid boundaries or wavy interfaces, especially for gases and light liquids. Thus Bernoulli’s theorem is commonly used to analyze flow outside the boundary layer, flow in supersonic nozzles, flow over airfoils, and many other practical problems.

ADD : it is the air stream vortices created by the air rushing against the wings at super sonic speeds,that enable a fighter aircraft to somersault and turn abruptly in flight.The second part of this post would dig deep into the physics behind this,including the derived equations….meanwhile,any idea about the same………?

NASA Friday reported that, as planned, the Lunar Crater Observation and Sensing Satellite (LCROSS), broke apart and crashed into the lunar surface at 1.5 miles per second, causing twin impacts. The point was to create craters and raise dust clouds in an effort to determine whether the moon hosts sources of water stored in the form of ice.”The LCROSS science instruments worked exceedingly well and returned a wealth of data that will greatly improve our understanding of our closest celestial neighbor,” said LCROSS principal investigator and NASA Ames Research Center project manager Anthony Colaprete, in a statement.NASA scientists will study information from the mission over the coming weeks to see if it holds evidence of lunar ice and water. “The team is excited to dive into data,” said Colaprete.

By the way,the commom man on the street, who expected some ‘Deep Impact’ style explosions and fireworks on the moon was totally disappointed,as the much hyped mission didn’t result in any visual extravaganza.

Caption : image provided by NASA shows an image taken shortly after the Centaur rocket impacted the moon taken from the Lunar Crater Observation and Sensing Satellite Friday morning Oct. 9, 2009. (AP Photo/NASA)

See the video :  http://www.youtube.com/watch?v=MQdED8zRSog

A ball is dropped from a height of 20 m above the surface of water in a lake. The refractive index of water is 4/3. A fish inside the lake, in the line of fall of the ball, is looking at the ball. At an instant when the ball is 12.8 m above the water surface, the fish sees the speed of the ball as (Take g = 10 ms^–2)

(a) 9 ms^–1

(b) 12 ms^–1

(c) 16 ms^–1

(d) 21.23 ms^–1                                                                                                 

The resources would be divided into a] notes  b] concepts  c] applications/problems  d] previous question papers [ IIT-JEE , AIEE,APMT,AIIMS Physics,AFMC Physics etc -last 15 - 21 yrs ] ,mock exam sessions [ online ] ,Tips & Tricks, and multimedia resources..viz,animations & videos.

The USP of  PHYSICSMYND is LIVE IIT-JEE PHYSICS VIDEO CLASSES taken by an expert team led by Dr.Kishore,an IIT Mtech alumini,and the brain child behind Physicsmynd.This is done using Skype [ username : physicsmynd ].Dr.Kishore is a pioneering IT entrepreneur,who specialises in computational applications in bio/nano technologies.He is presently working as the founder CEO of Xzeogenics Life Sciences  Physicsmynd is the first initiative of the Xzeogenics group in school education [ K-12 ] and is intended to provide quality education to the school community.

Principle chapters : 1] Kinematics 2] Laws of Motion 3] Work,Power & Energy, 4] Rotational motion 5] Gravitation 6] Simple Harmonic Motion 7] Properties of Matter 8] Wave motion 9] Heat & Thermodynamics 10] Optics 11] Current Electricity 12] Electrostatics 13] Magnetism 14] Electromagnetic Induction & AC Current and 15] Modern Physics.