A gramophone record has a diameter of 30.5 centimetres. The
centre is unused and has a diameter of 10 centimetres. There is also a smooth
outer edge 1.25 centimetres wide around the recording.
If the grooves are 36 to the centimeter, how far does the
needle move during the actual playing of the record?
Answer:
About Nine centimeter: the needle moves
from the outermost groove to the innermost groove in an arc. The radius of this
arc is the length of the pick – up arm.
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