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A Guide to Self Study Calculus - Physics Forums We often get questions here from people self-studying mathematics. One of those questions is what of mathematics should I study and in what order.

Has Anyone Ever Owned/Played DVD9s? • Physics Forums Most DVDs are DVD5s. Some - less common are DVD9s. I'm thinking of buying foreign language film that is a DVD9, but am not sure if it'd play on a normal DVD player. I've seen conflicting answers online. Some say they can always be played on regular DVD players, while others say you have...

How does the mechanism of a dual layer DVD read the data from both ... I read things like "When a dual layer DVD burner reads a dual layer disc, the read-laser readjusts its focus past the semi-transparent first layer of physical data, on to an additional layer of data." and "Reflectivity of both recording layers of a dual layer recordable disc is the similar...

How does a CD act like a diffraction grating? • Physics Forums Hi, I having been looking on the internet and other threads and can't seem to find any detailed information on how a CD acts like a diffraction grating. What I understand: the CD has lots of little bumps which can split up light into its various colors. These colors can interfere...

Kinematics equations: Prove that a=vdv/ds • Physics Forums You are mixing up two situations. The equation a=vdv/ds applies for a particle moving as a function of time. x=x (t), v=v (t). Yes, you can write v as a function of x, but only on the basis that the relation x=x (t) can be inverted. E.g. if x=f (t) and v=g (t) then t=f -1 (x), so v=g (f -1 (x)). The equation applies where f is a function of two independent variables, x and y. If you try to ...

Vinyl records, RPMs, and velocity. How does it work? FWIW, CDs and DVDs are recorded with the disk moving at a constant linear speed, and the rotation speed does change while the disk is playing. Because the data is recorded digitaally, it is easy for the player to "measure" how fast it is playing the disk, and so the rotation speed of a CD is actuallly controlled by the disk that is being played.

Question about plastic bags and humidity • Physics Forums Similar threads B Some questions about humidity and storing DVDs in a closed cardboard box Jul 21, 2023 Replies 3 Views 1K Question about humidity and plastic and rubber

Rainbow light reflection on TV from my hand • Physics Forums How is this possible? Could anyone debunk this by your physics knowledge? Ive seen the other rainbow reflections but they came from direct light sources. I am a buddhist practitioner and Im familiar with the 'Rainbow body' phenomena, but I wouldnt give so easily myself credit of such. There is...

The Secret: Transforming Mercury to Gold Using Everyday Materials These things pretty much purify themselves when you bring them together with a little bit of aluminum especially if you bring a gas burner into the picture, or you could get creative and build a heat ray from a satellite dish and tiny broken up CDs/DVDs, if you live in the slums it's not like you don't have time on your hands to do this anyway.

What is v(dv/dx) and how does it relate to acceleration? My mechanics syllabus suggests that we can model acceleration as ##v(dv/dx)## but what exactly does this mean? Can you give me (or link me to) some explanations and/or sample problems with worked solutions? In my experience so far we should always be using ##dv/dt## for ##a##.