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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”


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

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Rajat asked:

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

Sequence of Learning Physics

In what sequence should these chapters be prepared for my exams:-
units and dimensions,kinematics,laws of motion,work power and energy,motion of system of particles and rigid body dynamics,gravitation.

Apoorv Katoch asked


It is better to follow the same pattern as given in NCERT text book

Problem from Kinematics

The speed of a train changes from36km/h to 72km/h in 10sec. calculate the distance travelled during this time


u=36km/h = 10 m/s

v=72 km/h=20 m/s

t=10 s


use v = u+ at to find a

a = 1 m/s2

Use v2-u2=2aS to find S

S = (400-100)/2 = 150 m

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

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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

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