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# Tag Archives: www

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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”

**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

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

## Tensor

streess is** tensor**,then,what is meant by **tensor**?

rupasri

Ans:

**Tensors** are used to represent the **relation** between **vectors**. They are geometrical objects which show’s the **relation** between **vectors**, **vectors** and scalars.It is a geometrical maping of the relations .Tensor analysis ,a branch in mathematics is helping to **solve** the complex equations in which many **vectors** are involved

for further reference visit http://www.grc.nasa.gov/WWW/k-12/Numbers/Math/documents/Tensors_TM2002211716.pdf

## The SI & CGS unit of time is same .Why?

Almost in all systems of unit second is the unit of time, most probably because, second is the most convenient one, if we look at the** guidelines for selecting a unit.**

For more details refer to the following links

## Doubt from HC Verma’s Concepts of Physics Volume I

If any one can explain step wise calculation of Example no. 17 of Chapter 2 of concepts of Physics by H C Verma Vol. 1.

Thanks in advance

Ans:

Solutions to the entire problems from concepts of Physics by **HC Verma **available at http://sites.google.com/site/physicsclassroomonline as well as www.plustwophysics.com