Recent content by Cookiey

Thanks for the link! I'm not done reading it yet, but still thanks.

I don't understand why the presence of the medium makes it unsymmetric. Why isn't the speed perceived by an observer the only thing that matters?

I'm a bit confused about this. So say there's an observer and a source of sound. If the observer moves towards the source of sound, the frequency seems to increase because he encounters more wavelengths in the same amount of time. In a second case, if the source moved towards the observer, the...

Oh, the 've' is the 've' in posti've'. I'm sorry about that! My question sheet is a photocopy, there's a statement at the end of the original (which is cut off here) that says the graph is plotted between a and b only.

Thanks for replying! So the graph given in the question is not possible with any combination of positive and negative charges?

The electric field at a point is defined as the electrostatic force per unit positive charge, and its direction is the same as the direction of the electrostatic force on the unit positive charge, right? Im sorry, I don't understand my mistake. Which bit should I reconsider?

Homework Statement Two point charges a and b whose magnitudes are same positioned at a certain distance along the positive x-axis from each other. a is at the origin. The graph is drawn between electrical field strength and distance x from a. E is taken positive if it is along the line joining...

If we have a conducting loop, and a magnet (say North pole first) is pushed into it; that induces and emf and hence a current in the coil due to the changing magnetic flux, right? According to Lenz' law, the direction of the current is such that it opposes the change. So from the side the magnet...

I see! Thank you for replying! :)

Homework Statement If f:(2,4)-->(1,3) where f(x)=x-[x/2] (where[.] denotes the greatest integer function), then find the inverse function of f(x). Homework Equations (None I believe.) The Attempt at a Solution I know that for a function to be invertible, it must be both one-one and onto...

All right, thank you very much!

And if one end of this wire was fixed to a wall and force F was applied on the free end, it would still experience the same tension F as in the earlier case because of reaction force from the wall?

Yes, thank you very much! So if there /is/ such a wire which is experiencing a force F on both sides, and assuming it experiences equal tension everywhere; the tension would be F?

Homework Statement consider a horizontal cylindrical tube of cross sectional area A fitted with two frictionless pistons. The piston are connected to each other by an inextensible wire. Initially, the temperature of the gas is To and its pressure is Po which equals the atmospheric pressure...