How to use the Apple Watch Workout app: View progress during your workout. By default the Workout app shows progress towards your goal (if you specified one) as a ring on the lefthand side of the screen-as on the Activity app, the ring fills in clockwise and a complete ring represents a completed target.
Man-Made Noise (Industrial Noise) By man-made noise or industrial- noise is meant the electrical noise produced by such sources as automobiles and aircraft ignition, electrical motors and switch gears, leakage from high voltage lines, fluorescent lights, and numerous other heavy electrical machines.
An instrument creates sound when part of it vibrates rapidly. The column of air inside a wind instrument, the string of a string instrument, or the stretched skin of a drum all vibrate when played. This vibration produces sound waves in the air, which we hear as musical notes. When a musician hits a key, a hammer strikes a string inside the piano. The string vibrates, making a sound. In a grand piano the strings are arranged horizontally.