Question: Back in the day, a 1 1 cm diameter, 2 - meters redwood shaft was used as the drive shaft for the TZU cotton gin.

Back in the day, a

11

cm diameter,

2 -

meters redwood shaft was used as the drive shaft for the TZU cotton gin. In

1939,

a little

19

kw motor was turning the shaft at

100

rpm when it broke. Redwood has an allowable torsional shear stress of

10

MPa and a maximum angle of twist of

4

degrees.What was the cause of the drive shaft breaking: was there too much stress in the shaft or did it twist too much?Please show calculations to support your answer. Modulus of elasticity in shear

(

)

for redwood is

3.5

GPa.

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