Recent content by Thinker8921

What is the relationship (a mathematical one) between the density and the refractive index of a medium?

I can never seem to create proofs the way it is shown in every textbook I've seen. To be honest, I don't really know how to write the proofs correctly. I've seen sometimes my reasons are flawed and other times I go around aimlessly and get home after some unnecessary steps. So I would just like...

Thank-you, that explains it well.

Try this: http://tutor4physics.com/projectilemotion.htm It should cover things well.

Yes that makes sense. Although that's the first time I've heard of pressure rise and fall in a sound wave. Usually, I say compressions and rarefactions of the moving particles. :smile: Doesn't this also apply if vw=vm as well if the waves have not already combined together to form the sonic...

I don't quite understand this. What exactly do you mean by the pressure dropping and falling? I get the next part about how the sound wave will not extend forwards (with respect to the wave source). This means that at one point, the sound waves all merge to became a sonic wave, but the question...

Thank-you for that, I found it on Wikipedia too: "The above formula works for sound wave if and only if the speeds of the source and receiver relative to the medium are slower than the speed of sound." So, there is a sonic boom where the sound waves collide. This causes a great 'thump' of...

vw= Velocity of Wave vm= Velocity of Wave Source fw= Frequency of the Wave fd= Frequency of the Wave relative to Detector as Wave Source is also moving q= Infinity For the wave frequency detected by a detector at rest as the wave source* is moving towards it, there is: fd=( vwfw )/(...

In maths, especially the Greek maths in those days, a point has no size only a position in space. So under this, it is reasonable to think that there are infinite number of points in a line.

Thanks for clearing that up. I got it now.

Could someone please clear a doubt I have with infinity being taken as a value. I would like to start from the beginning to be clear. The sum of a geometric series is given by: S=(rB-A)/r-1 Where S=sum of the series, r= ratio between terms, B=last term, A=first term. Now B=A(r^N-1). So...

Thanks, this has made it clearer to me.

Thankyou for the reply. I think I should have been a little clearer. I am in high school and this depth is a little new so I don't understand the whole explanation. -The theta sign with the 2 dots*, I am thinking it is angular acceleration? That way, mLa will be torque of the pendulum bob. - I...

I know the L/T^2 relationship of a simple pendulum gives a constant- g/(2pi)^2. Could anyone please show me how it is derived? Thanks in advance.