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Physics 125
Discussion #15
1
Problem 1: Throwing a discus
A discus thrower moves the discus in a circle of radius 80.0 cm. At a certain instant, the
thrower is spinning at an angular speed of 10.0 rad/s and the angular speed is increasing
at 50.0 rad/s
2
.
1.
What is the tangential component of the acceleration of the discus at this time?
2.
What is the centripetal component of the acceleration of the discus at this time?
3.
What is the magnitude of the acceleration?
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View Full Document Physics 125
Discussion #15
2
Problem 2: An electric ceiling fan
An electric ceiling fan with blades 0.750 m in diameter is rotating about a fixed axis with
an initial angular velocity of 0.250 rev/s. The angular acceleration is 0.900 rev/s
2
.
1.
First, list all the known factors.
Initial angular velocity:
ω
0
=
Angular acceleration:
α
=
2.
What is the angular velocity after 0.200 s?
3.
Through how many revolutions has the blade turned in this time interval?
4.
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This homework help was uploaded on 04/10/2008 for the course PHYSICS 125 taught by Professor Unknown during the Fall '08 term at University of Michigan.
 Fall '08
 unknown
 Acceleration

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