# I Exam 1 Name: UNID:

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I Exam 1 Name: UNID:
```Plnsics 2020
S u m m e r 2016
R i c h a r d Inochrc'tsen
Exam 1
Name:
UNID:
TA:
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A.
Name the quantity measured in W/m2
B.
Name the quantity measured in decibels
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C.
Given the following scenarios, identify the wavelength of the standing wave, in terms of the given length f .
«y
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^
^
2.
x
(\
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The fundamental frequency in a pipe of length 3-f which is open at one end
,
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p „ hj/
D.
Gamelan is a traditional form of music found in Indonesia, and it is largely comprised of sounds made by pitched
percussion instruments. Gamelan instruments are frequently played in pairs that are tuned to slightly different
pitches (in other words, different frequencies) to produce a "shimmering" sound when played together, which
some say has symbolic meaning. Write an equation to find the frequency fbeat of the "shimmering" effect in
terms of the frequencies /x and f2 of the individual instruments.
E.
As discussed in lecture, which US state has the most lightning strikes?
F.
The charge per unit length on a glass rod is 0.0050 C/m. If the rod is 2 mm long, how many electrons have been
removed from the glass rod?
Summer 2016
Phvsics 2020
Richard Injiebretsen
Exam 1
Name:
UNID:
TA:
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2
You are on a spaceship travelling through the universe when your
ship is boarded by space pirates. In the epic battle that ensues, you
are knocked unconscious. When you come to, you find that your
robot assistant has defeated the pirates and driven them off of your
ship. However, your ship has landed somewhere, and you don't
know where you are. To measure the acceleration due to gravity,
you hang a 0.268 kg ball from the end of a wire. The wire has a
length of 0.835 m and a uniformly distributed mass of 3.0 g. Using
electronic equipment, you measure the time for a transverse pulse to
travel the length of the wire and obtain a value of 0.0722 s. The
mass of the wire is negligible compared to thermass of the ball. Use
the table, which lists the acceleration due to gravity on several
planets or moons. Where are you?
Location
Sun
Jupiter
Neptune
Saturn
Earth
Venus
Uranus
Mercury
JVIars
\io
Moon
Ganymede
Titan
Europa
Callisto
Triton
Pluto
£\s
Jceres
Phobos
Deimos
B.
Acceleration due to gravity
28.02g
2.53g
1.14g
1.07g
1.00g
0.904g
0.89g
0.38g
0.376e
oiiieT^
0.1654g
X^T-N
f r}
> /
i
f*^
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°-15g
h
0.134g
^^_^
0 ^^°
14s
0. 126g
0
0.0797g
0.067g
0.0677g
0.0275g
0.0113g
0.0005814g
0.000306g
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.
Create the y vs. & graph of a wave that has an amplitude of 3.0 m, a speed of 20 m/s and frequency of 5 Hz.
Remember to label your axes and include units!
Richard Ingebretsen
Summer 2016
Physics 2020
Exam 1
Name:
UNID:
TA:
3
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A.
A speedboat, starting from rest, moves along a straight line away from a dock. The boat has a constant
acceleration of 3.00 m/s". Attached to the dock is a siren that is producing a 755-Hz tone. If the speed of sound is
343 m/s, what is the frequency of the sound heard by a person on the boat when the boat's displacement from the
dock is 45.0 m?
a- 3 •»«/\$•*•
B.
When a stone is thrown into a pond, it takes 0.45 ms for the sound of the stone's splash to reach the bottom of the
pond. Assuming that water has a Bulk modulus of 2.2 x 109 N/m2, how deep is the pond?
V*
c.
L,W A
- r ^ 7 ^?
Line A
You now throw two stones into the pond. They land simultaneously 3.2 m
apart and create waves of wavelength 1.6 m that are in phase. In the
drawing, line A connects the two splashes, and line B is perpendicular to
line A. Find one point on each line where constructive interference^occurs^
Iffl
-' u
Physics 2020
Richard Ingcbretsen
a,,,,..,,^,*^,,-.™,!,™™,.,,,,,*.,,^,,, :„»«»,—a™,,.,.,,™.™ -,,^-^^^^n^.^,m,^a^^:,,^^,,,..f^m,^^r^,n,^,,,^,r,^,^m,m,f^—.
—^^^^.^^^^.^^^^.^^^^.^^^^^^^^^^mm^^^^^^,^^,
Exam 1
Name:
UNID:
TA: l04&s\r 2016
A.
A student watching a baseball game hears the ball hit the bat at 70 dB. As expected, the student is sitting in the
nosebleed seats and is sitting about 160 m from the batter. Assuming the sound from the collision moves outward
in all directions and that none of the sound was blocked by any buildings.
6
1. What sound intensity level would the pitcher hear if he were 18 m from the source of the sound?
*• 2. How much sound energy was produced during the collision if the sound lasted for 0.02seconds?
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B.
F ~
L-'
If**
The force of repulsion that two like charges exert on each other is 3.5 N. What will the force be if the distance
between the charges is increased to five times its original value?
F-
C.
Near the surface of Earth an electric field points radially downward and has a magnitude of approximately
100 N/C. What charge (magnitude and sign) would have to be placed on a penny with a mass of 3 g to cause it to
rise into the air with an upward acceleration of 0.19 m/s2?
y
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```
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