Let's begin with the angular acceleration of a compact disk (cd). to play music the cd must rotate at high speed while a laser reads data encoded in a spiral pattern on the disk. the disc has radius r=6.0cm=0.060m; when data are being read, it spins at 7200 rev/min. what is the cd's angular velocity ω in radians per second? how much time is required for it to rotate through 90∘? if it starts from rest and reaches full speed in 4.0 s, what is its average angular acceleration?

Wo audio speakers are placed on a vertical rail. speaker a is placed at head-level while speaker b is place at some variable height, \delta yδy, above speaker a. both speakers receive simultaneous input from a sine-wave generator so the speakers each produce a pure sinusoidal sound wave with a wavelength of 0.531 meters. calculate the lowest height that speaker b can be placed above speaker a to produce a minimum of sound heard by person standing \delta x = 7.86δx=7.86 meters directly in front of speaker a.

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

A17,250 kg rocket is pushed with a thrust of 6,450,284 n. what is the acceleration of the rocket?