Physics 1A
Winter 2009:
Quiz 5
Version A
1
03.03.08
Closed book.
No work needs to be shown for multiplechoice questions.
1
.
A wheel initially has an angular velocity of 18 rad/s but it is slowing at a rate of 2.0 rad/s
2
until it comes to a stop.
By the time it stops it will have turned through:
>
(a) 80 rad.
(b)
160 rad.
(c)
200 rad.
(d)
300 rad.
(e)
400 rad.
2
.
If a wheel is turning at 3.0 rad/s, the time it takes to complete one revolution is about:
(a)
0.3 s.
(b)
0.6 s.
(c)
1.0 s.
(d)
1.3 s.
>
(e)
2.0 s.
3
.
What centripetal acceleration does an 80 kg person experience when seated 12 m from the
center of a merrygoround whose angular speed is 0.50 rad/s?
(a)
20 m/s
2
.
(b)
10 m/s
2
.
>
(c)
5 m/s
2
.
(d)
30 m/s
2
.
(e)
0.1 m/s
2
.
4
.
A 0.30kg rock is swung in a circular path and in a vertical plane on a 0.25mlength string.
At the top of the path, the angular speed is 12.0 rad/s. What is the tension in the string at that
point?
>
(a)
8 N.
(b)
16 N.
(c)
18 N.
(d)
80 N.
(e)
140 N.
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Physics 1A
Winter 2009:
Quiz 5
Version A
2
03.03.08
5
.
An ice skater with a moment of inertia of 70.0
kg
!
m
2
is spinning at 4.1 rad/s.
If the skater
pulls in her arms, her rotational inertia decreases to 50.0
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 Spring '09
 ANDERSON
 Angular Momentum, Force, Moment Of Inertia, Rotation, Physical quantities

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