Recent content by Avi Nandi

Let's consider two inertial frame S and S'. S' moves with speed v w.r.t S along x-axis towards the right. Now we can draw the two co-ordinates system. The t' axes will make an angle arctan(v/c) with t axes rotated towards x-axis and similarly the x' axis will be tilted towards the t axes...

Thanks Chronos and Kimbyd.

Can anyone give an idea about primordial non gaussianity in a popular way??

I have completed post grad in Physics and in the transition phase between post grad and Ph.D. I am interested in cosmology and also completed a post grad course on Astrophysics and Cosmology. Can anyone enlighten me about what are the current debates and active topics of research going on in...

The problem: there is a charge and current configuration. Electric field and magnetic field originates from this configuration. The charges now move under the influence of the field in time dt. What is the work done by the field? While calculating the work done we take force as ∫ρ(E+v×B).vdt...

Suppose some charge and current config is present which at time t produces fields E and B. In the next instant dt the charges move around a bit. Work done on the charge q F.dl=q(E+v×B).vdt=qE.vdt dW/dt= qE.v Now the question is q has also contribution in the field E. How the charge is exerting...

For observation of Brownian motion, the mass and the size of the Brownian particle should be very small. Within what range the size and mass of the Brownian particle should lie?? Can a particle with small mass and bigger size and vice versa can undergo Brownian motion??

Mathematics is the language of Nature. The more advanced topics we study , the more involving is the maths. To understand physics, I think i need to develop a strong mathematical intuition and learn to appreciate the beauty of maths. Can anyone suggest a good flowchart of topics so that my...

Homework Statement A Yo-Yo of mass M has an axle of radius b and a spool of radius R. Its moment of inertia can be taken to be MR^{2}/2 and the thickness of the string can be neglected. The Yo-Yo is released from rest. The center of the Yo-Yo descends distance h before the string is fully...

I took up as the positive direction. But I think T and g are always opposing each other. I have written a constraint equation A + a = Rα. But the clue given in the book is " if A= 2a then α= 3A/R"

Homework Statement A disk of mass M and radius R unwinds from a tape wrapped around it. The tape passes over a frictionless pulley and mass m is suspended from the other end. Assume that the disk drops vertically. a. relate the accelerations of mass m and disk ,a and A, respectively to...

If the spin velocity is constant then the time period will be the same. But if the spin has some acceleration then the oscillation may be damped or lose it's oscillatory character. Am i correct?

Homework Statement Find the period of a pendulum consisting of a disk of mass M and radius R fixed to the end of the rod of length l and mass m. How does the period change if the disk is mounted to the rod by a friction less bearing so that it is perfectly free to spin? The centre of the...

Force is always acting perpendicular to the velocity. So no work is done. Thats why kinetic energy is conserved. Velocity is constant. :) thank you tiny tim. Your help is not tiny at all.

Homework Statement Mass m is attached to a cylindrical post of rdius R by a string. Initially it is distance r from the centre of the post and is moving tangentially with speed v_{0}. In case (a) the string passes through a hole in the centre of the post at the top. the string is...