Asked by Sandra
A rope is wound 50 times round a c ylinder of radius 25cm .how long is the rope(use pie as 22/7
Answers
Answered by
oobleck
the cylinder has circumference 2πr = 50π
so, 50 times around would be 2500π cm
Naturally, the rope would have to be somewhat longer, because either
(a) the coils lie side-by-side, so the shape is really a helix
(b) the coils overlap, meaning that the circumference grows by the diameter of the rope for each overlap.
so, 50 times around would be 2500π cm
Naturally, the rope would have to be somewhat longer, because either
(a) the coils lie side-by-side, so the shape is really a helix
(b) the coils overlap, meaning that the circumference grows by the diameter of the rope for each overlap.
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