Home » Posts tagged 'doubt' (Page 2)

# Tag Archives: doubt

## Optics

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

## EXCEEDING COSMIC LIMIT

“i’ve a beautiful doubt…normally we believe that nothing in dis world can cross cosmic limit…now suppose if 2 light particles(velocity=c) collide at right angles,,then their resultant will be [c*root2]…but that is greater than cosmic limit,right?????”

LET THE VISITORS RESPOND

## 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.

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

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

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$(a+b)^{2}=a^{2}+b^{2}+2ab$

## Find time of death of patient with differential equations

“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

## magnetic field

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

chirag