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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”


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

How to walk through walls?

Illusion optics create an invisible gateway

Chinese researchers have devised an invisible gateway.

Read more at http://physicsworld.com/cws/article/news/44576

A question on Quantum Entanglement

I have read a lot about quantum mechanics but have a query.
using an entangled photon for this question.

If you can’t measure an entangled photon without affecting it’s entanglement then how do we know it was even entangled to start with and not just always a certain “spin”, either up or down. How can we say for sure that it is both at the same time (entangled) with never observing or measuring this?

[LM posted this]


As of now, We can only give you some links for further reference. Learnt visitors can respond with  an anwer.

Links recommended.

  1. http://plato.stanford.edu/entries/qt-entangle/
  2. http://www.wired.com/wiredscience/2010/06/human-quantum-entanglement-detector/
  3. http://en.wikipedia.org/wiki/Quantum_entanglement
  4. http://en.wikipedia.org/wiki/EPR_paradox
  5. http://calitreview.com/51

Why is it more neat when we tear a sheet from the newspaper vertically and rough when torn horizontally?

Sreeda asked:

Why is it more neat when we tear a sheet from the newspaper vertically and rough when torn horizontally?


Please refer to the following link:


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Differences Between EMF and Potential Difference

What is main relationship between EMF and potiential difference?

Answer: The question is already answered at http://askphysics.com/difference-between-emf-and-pd/

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October 2020

Schrodinger’s Cat in Daily Life

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