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Vinyl records, RPMs, and velocity. How does it work? - Physics Forums 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 whether UV light can penetrate a cardboard box In summary, cardboard absorbs some UV light, but it's not 100% protective and it's not safe to keep delicate items like DVDs or paintings in it. If you're concerned about UV damage, you should just add extra shielding.

Dichloromethane + Polycarbonate - Physics Forums It is commonly used in the production of various products such as eyeglass lenses, DVDs, and electronic components. What is the significance of the combination of dichloromethane and polycarbonate? The combination of dichloromethane and polycarbonate is important because dichloromethane is a solvent for polycarbonate and is used in the ...