What is the tangential velocity of a record player which makes 11 revolutions in 20 seconds?

Two polarizers are oriented at 40∘ to each other and plane-polarized light is incident on them. if only 16 percent of the light gets through both of them, what was the initial polarization direction of the incident light?

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

Increasing the pressure on one spot of a fluid will increase the pressure everywhere else in the fluid a. pascals principal b. archimedes' principal c. bernoulli's principal