A body is rotated in a circular path by means of a wire, which fails at angular velocity ωo. If the wire is cut into two equal pieces and the same body is rotated by means of the two pieces together, then the failure takes place at angular velocity ω . The ratio ωo/ω is (neglect gravity) ?
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Maximum force acting on the bob is given by
F=mrω
2
σ
max
=
A
F
=
A
mlω
2
ω=
ml
σ
max
A
=
(10)(0.3)
(4.8×10
7
)(10
−6
)
=4rad/s
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