Exam
Name___________________________________
MULTIPLE CHOICE.
Choose the one alternative that best completes the statement or answers the question.
1) At time
t
=
0 s, a wheel has an angular displacement of zero radians and an angular velocity of
+
28 rad/s. The wheel has a constant acceleration of

0.50 rad/s
2
. In this situation, the time
t
, at
which the wheel comes to a mandatory halt, is closest to:
1)
A) 46 s
B) 65 s
C) 56 s
D) 28 s
E) 37 s
2) A turbine blade rotates with angular velocity
Ν
(
t
)
=
2

0.6
t
2
. What is the angular acceleration of
the blade at
t
=
9.30 s?
2)
A)

24.9 rad/s
2
B)

49.9 rad/s
2
C)

5.58 rad/s
2
D)

11.2 rad/s
2
E)

9.16 rad/s
2
Figure 9.1
Point
P
is on the rim of a wheel of radius 2.0 m. At time
t
=
0, the wheel is at rest, and
P
is on the
x

axis. The wheel
undergoes a uniform angular acceleration of 0.01 rad/s
2
about the center
O
.
3) In Fig. 9.1, the tangential acceleration of
P
at time
t
=
0 s is closest to:
3)
A) zero
B) 0.005 m/s
2
C) 0.015 m/s
2
D) 0.020 m/s
2
E) 0.010 m/s
2
Table 9.1
4) In Table 9.1, the masses and the coordinates
x
and
y
of a set of three point masses in the
x

y
plane.
The masses are interconnected by light struts, forming a rigid body. The moment of inertia of the
rigid body, through the center of mass and perpendicular to the
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 Spring '07
 D. V
 Angular Momentum, kg

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