VERSION B
CLOSED BOOK TEST
Duration: 75minutes
PART I MC questions. To be answered using SCANTRON sheets
Best 8 answers count toward 70% of the test grade
1.
A uniform rod (mass
m
=
1 kg and length
L
=
2 m ) pivoted at one end oscillates in a vertical plane. The period (in
s)
of oscillation is approximately
a. 4.0.
b. 1.6.
c. 3.2.
d. 2.3.
e. 2.0.
2.
Two circus clowns (each having a mass of 50 kg) swing on two
flying trapezes (negligible mass, length 25 m) shown in the
figure. At the peak of the swing, one grabs the other, and the
two swing back to one platform. The time for the forward and
return motion is
a. 10s
b.
50s
c.
15s
d.
20s
e.
25s
3
A truck moving at 36 m/s is moving toward a police car moving
at 45 m/s in the opposite direction. If the frequency of the siren
relative to the police car is 500 Hz, what is the frequency heard
by an observer in the truck as the police car approaches the
truck? (The speed of sound in air is 343 m/s.)
a.
396
b. 636
c.
361
d.
393
e.
617
4
If
y
= 0.02 sin (30
x
– 400
t
) (SI units), the angular frequency of the wave is
a.
30 rad/s
b.
30/2π
rad/s
c.
400/2π
rad/s
d. 400 rad/s
e.
40/3
rad/s
5.
A string is stretched and fixed at both ends, 200 cm apart. If the density of the string is 0.015 g/cm, and its tension is 600
N, what is the wavelength (in cm) of the first harmonic?
a.
600
b. 400
c.
800
d.
1000
e.
200
6
.
A charge
q
is located inside a spherical surface of radius
r
. What happens to the net electric flux through the side walls
when the sphere is replaced by a cube of side r?
a. It changes by a factor of
4
3
π
.
b. It changes by a factor of
.
c. It changes by a factor of 4
.
d. It changes by a factor of
3
2
.
e. It remains the same.
7.
Three capacitors are placed in parallel. Their capacitances are 3
F
μ
, 6
F
, and 9
F
. What is their total capacitance in
F ?
a. 4
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 Fall '08
 CZAJKOWSKI
 Physics, Mass, Hertz, Electric charge, Fundamental physics concepts, police car

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