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20 g = 20 * 9.807 = 196.14 (m/s)/s

radius = 29 ft (uk) = 8.839 metres

circumference = 2 * pi * 8.839 = 55.54 metres

if:

a = v^2 / r

then:

v = sq. root (a * r)

v = 41.64 metres / sec

41.64/55.54 = 0.75 rev / sec

0.75 * 60 = 45 rev / min

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