Adigital audio compact disc carries data, each bit of which occupies 0.6 µm along a continuous spiral track from the inner circumference of the disc to the outside edge. a cd player turns the disc to carry the track counterclockwise above a lens at a constant speed of 1.40 m/s.
(a) find the required angular speed at the beginning of the recording, where the spiral has a radius of 2.60 cm. rad/s
(b) find the angular speed at the end of the recording, where the spiral has a radius of 5.70 cm. rad/s
(c) a full-length recording lasts for 74 min 33 s. find the average angular acceleration of the disc. rad/s²
(d) assuming that the acceleration is constant, find the total angular displacement of the disc as it plays. rad
(e) find the total length of the track.

If the moon has a diameter of 2,159.14 miles, what is the maximum distance that it could be observed by the naked eye with enough detail that you could distinguish it from other celestial bodies (assuming that you have 20/20 vision)

When using two-wire cable to feed a 240-v appliance that does not require a neutral wire, you should a. mark both ends of the white wire green. b. use the cable as is. c. use only the black wire. d. mark both ends and any exposed area of the white wire black.

Air is held within a frictionless piston-cylinder container, which is oriented vertically. the mass of the piston is 0.45 kg and the cross-sectional area is 0.0030 m2. initially (state 1) the pressure of the gas is sufficient to support the weight of the piston as well as the force exerted by the atmospheric pressure ( 101.32 kpa). the volume occupied by the air within the cylinder in state 1 is 1.00 liter. one end of a spring (with spring constant k = 1000 n/m) is attached to the top of the piston, while the other end of the spring is attached to a stage that can move vertically. initially the spring is undeflected and therefore exerts no force. then the stage is then moved quasistatically downward a distance of 10.0 cm, at which point the system reaches state 2. the piston-cylinder is not insulated; rather it remains in diathermal contact with the surroundings, which are at a constant temperature of 300 k. what is the change of pressure within the container?