Q1. A certain groove in phonograph record moves past the needle at 36 cm/s. If the wiggles in the grove are 0.1 mm apart, what is the frequency of sound that is produced?
Q2. Coin is placed 14.0 from the axis of the rotating turntable of variable speed. When the speed of the turntable is slowly increased, the coin remains fixed on turntable until a rate of 40.0 (revolutions per minute) is reached, at that point the coin slides off.