Question

A uniform rod of mass 3.45×10^{−2} kgkg and length 0.360
mm rotates in a horizontal plane about a fixed axis through its
center and perpendicular to the rod. Two small rings, each with
mass 0.250 kgkg , are mounted so that they can slide along the rod.
They are initially held by catches at positions a distance
4.80×10^{−2} mm on each side from the center of the rod,
and the system is rotating at an angular velocity 28.0
rev/minrev/min . Without otherwise changing the system, the catches
are released, and the rings slide outward along the rod and fly off
at the ends.

a) What is the angular speed of the system at the instant when the rings reach the ends of the rod?

b)What is the angular speed of the rod after the rings leave it?

Answer #1

A uniform rod of mass 3.40×10−2 kg and length 0.410 m
rotates in a horizontal plane about a fixed axis through its center
and perpendicular to the rod. Two small rings, each with mass 0.190
kg , are mounted so that they can slide along the rod. They are
initially held by catches at positions a distance
5.50×10−2 m on each side from the center of the rod, and
the system is rotating at an angular velocity 28.0 rev/min ....

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A rod of length 10 m rotates about an axis perpendicular to its
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9.38
An airplane propeller is 1.86 mm in length (from tip to tip)
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