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Now users at Ask Physics can add equations to their comments and questions.

Ask Physics has installed the Latex server and now users can type latex code to insert complex equations to their comments or questions.

If you are not familiar with latex code, use the following site to generate the code for the equation that you need.

http://www.codecogs.com/latex/eqneditor.php

When you visit the above site you can edit and view the result of the code generate. You have the option to copy the image of the equation or to copy the code itself (what you typed for getting the image equation; not the html code supplied) and paste the code in your comment.

Go, Try it Now!
(a+b)^{2}=a^{2}+b^{2}+2ab

Find time of death of patient with differential equations

Mr. N.P. Sahani asked:

“The differential equation and solution for finding the time of death of a patient”

Answer:

See that the question is to find the time of death (Not predicting the time of death. I thought that when I read it first.)

I can give some links which will be helpful in this connection

  1. http://www.exploreforensics.co.uk/estimating-the-time-of-death.html
  2. http://en.wikipedia.org/wiki/Thermal_death_time
  3. http://autarkaw.wordpress.com/2008/07/21/time-of-death-a-classic-ode-problem/
  4. http://people.uncw.edu/lugo/mcp/DIFF_EQ/deproj/death/death.htm
  5. http://mathforum.org/library/drmath/view/53409.html
  6. http://www.scribd.com/doc/21514655/Newton-s-Law-of-Cooling-Finding-the-Time-of-Death-of-a-John-Doe

magnetic field

Which one we should use Bio saverts law or amperes law to find a magnetic field?

chirag

Answer

Both are used to find the magnetic field .In the case  of physical magnet Biot-Savarts law can be used

In the case of a current carrying conductor Ampers circuital law is used

Superman, Time Travel, Relativity and confusion!

In the original Superman movie, Superman flies around the world opposite its rotation at a speed faster than light (or close o it) and witnesses time running backwards. But at such speed, time would slow down for Superman, but not stop, and certainly not move backwards, would it? Instead of seeing people and events moving backwards and undoing themselves, wouldn’t everything on Earth appear to simply stop moving to Superman?

(Cybele Cotter asked)

Answer:
Superman
It was a common belief among the fans of relativity that – ” if any object travelled with the speed of light, then time would stop for him and if he traveled faster, he would go back in time.”

But, there is some tweaks required somewhere which we strongly expect to take place in the near future which would remove the absurdity in theory and practice.

Superman” is fiction and was considered a person who can go back in time. This was not based on relativity. But, based on the results of relativity, we tried to believe that such a thing is possible if we could travel that fast.

When Superman goes back in time, He going to that past and correcting some mistakes happened in the past. Such a thing is practically impossible with the present technologies  and techniques.

IIT Kanpur : Previous Question Papers of JAM for MSc

Previous years Question Papers of JAM

Paper Name
2005
2006
2007
2008
BT
BT
BT
BT
BT
CA
CA
CA
CA
CA
CH
CH
CH
CH
CY
GG
GG
GG
GG
GG
GP
GP
GP
GP
GP
MA
MA
MA
MA
MA
MS
MS
MS
MS
PH
PH
PH
PH
PH

Kinematics Numerical Problems

The velocity m, v m/s, of a particle is a straight line is given by
v = 6+pt+qt³
where t is the time in seconds after the particle passes through a fixed point O.
Given that t=2 s the distance of the particle from O is 16 m and its acceleration is 32m/s², calculate

a) the value of p and of q
b) the velocity of the particle at the instant when did acceleration is zero

Numerical Problems from Pressure, Density and Floatation

1. Ramesh buys 6 bottles of syrup each containing 1litre. Each empty bottle weighs 400g. The density of syrup is 1.2 g/cm3. What weight does Ramesh have to carry home?

2. The volume of 900g of a substance is 1000 cm3. Will the substance sink or float in water if the density of water is 1g/cm3. What will be the mass of water displaced by the substance?

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