Asked by Arielle
The pulley attached to the turning knob of a radio has a radius of 35 mm. How far will the needle move if the knob is turned a quarter of a revolution?
Answers
Answered by
Steve
an arc s on a circle of radius r is subtended by an angle θ:
s = rθ
r=35
θ = π/2
If the needle is attached to the string wrapped around the pulley, it will also move the same distance.
s = rθ
r=35
θ = π/2
If the needle is attached to the string wrapped around the pulley, it will also move the same distance.
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