Time and Date Stamps (logged): 17:12:20 06-10-2020
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Physics II
General College Physics (Phy 202) Test 2
Completely document your work and your reasoning.
You will be graded on your documentation, your reasoning, and the
correctness of your conclusions.
** Write clearly in dark pencil or ink, on one side of the paper
only. **
Test should be printed using Internet Explorer. If
printed from different browser check to be sure test items have not been cut off. If
items are cut off then print in Landscape Mode (choose File, Print, click on Properties
and check the box next to Landscape, etc.).
Name and Signature of Student
_____________________________
Signed by Attendant, with Current Date and Time:
______________________
If picture ID has been matched with student and name as
given above, Attendant please sign here: _________
Instructions:
- Test is to be taken without reference to text or
outside notes.
- Graphing Calculator is allowed, as is blank paper or
testing center paper.
- No time limit but test is to be taken in one
sitting.
- Please place completed test in Dave Smith's folder,
OR mail to Dave Smith, Science and Engineering, Va. Highlands CC, Abingdon, Va.,
24212-0828 OR email copy of document to dsmith@vhcc.edu,
OR fax to 276-739-2590. Test must be returned by individual or agency supervising test. Test is not to be returned to student after it has been taken. Student may, if proctor deems it feasible, make and retain a copy of the test..
Directions for Student:
- Completely document your work.
- Numerical answers should be correct to 3 significant
figures. You may round off given numerical information to a precision consistent
with this standard.
- Undocumented and unjustified answers may be counted
wrong, and in the case of two-choice or limited-choice answers (e.g., true-false or
yes-no) will be counted wrong. Undocumented and unjustified answers, if wrong, never get
partial credit. So show your work and explain your reasoning.
- Due to a scanner malfunction and other errors some
test items may be hard to read, incomplete or even illegible. If this is judged by
the instructor to be the case you will not be penalized for these items, but if you
complete them and if they help your grade they will be counted. Therefore it is to
your advantage to attempt to complete them, if necessary sensibly filling in any
questionable parts.
- Please write on one side of paper only, and staple
test pages together.
Test Problems:
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Constants
Constants:
| k = 9*10^9 N m^2 / C^2 |
qE = 1.6 * 10^-19 C |
h = 6.63 * 10^-34 J s |
| energy of n=1 orbital in hydrogen atom: -13.6 eV |
k ' = 9 * 10^-7 T m / amp |
atomic mass unit: 1.66 * 10^-27 kg |
| electron mass: 9.11 * 10^-31 kg |
speed of light: 3 * 10^8 m/s |
Avogadro's Number: 6.023 * 10^-23 particles/mole |
| Gas Constant: R = 8.31 J / (mole K) |
proton mass: 1.6726 * 10^-27 kg |
neutron mass: 1.6749 * 10^-27 kg |
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Problem Number 1
If a transverse traveling wave in a string of density 7.26 grams/meter has
wavelength 1.8 meters and the period of a cycle of the wave is .089 second, then what is the
tension in the string?
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Problem Number 2
Two sources separated by 5.2 meters emit waves with wavelength .64 meters emit
waves in phase. The waves travel at identical velocities to a distant observer.
At any point along the perpendicular bisector of the line segment connecting the
two points, the two waves will arrive in phase an hence reinforce. At what nonzero
angle with the perpendicular bisector will the first interference maximum be observed?
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Problem Number 3
Beads, each with mass 8.2 grams, are located at a spacing of 25 cm along a light
but strong string. At t = 0 bead A is moving in the y direction at .0928 m/s, and
this bead is at at y position .0027 meters, while the bead to its right is at y position .0012
meters and the bead to its left at y position .0024 meters. The string tension is 19
Newtons, and the string lies along the x axis.
Find:
- the acceleration of the given bead
- its approximate velocity .03 seconds later and
- the distance it will move in the .03 seconds.
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Problem Number 4
A string of length 9 meters is fixed at both ends. It oscillates in its
fundamental mode with a frequency of 151 Hz and amplitude .71 cm. If its mass is 8
grams, then what tension is it under?
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Problem Number 5
Find the frequencies of the first four harmonics of a standing wave in a uniform
string of length 9 meters which is fixed at both ends under a tension of 35 Newtons, and
which has mass 31 grams.
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Problem Number 6
Traveling waves are set up in a pair of long strings by a single harmonic
oscillator. The strings have identical mass densities of 6.3 grams / meter.
Both strings terminate at a short bungee cord attached to a wall. The
harmonic oscillator is attached to the other ends of the strings in such a way that one
string is 5.3 meters longer than the other. If the oscillator has frequency 58 Hz:
- Give at least two string tensions which will produce the maximum motion of
the bungee cord.
- Give at least two string tensions which will produce the minimum motion of
the bungee cord.
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Problem Number 7
If hearing threshold intensity is 10^-12 watts/m^2, then what is the intensity
of a sound which measures 31 decibels?
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Problem Number 8
A candle flame is 1.52 cm high and 10 cm from a circular mirror of radius 5 cm.
- Where will the image of the flame form and how large will it be?
- Will it be real or virtual? Will it be upright or inverted?
- Sketch a ray diagram explaining how the image is formed.