Physics II

Time and Date Stamps (logged): 17:12:20 06-10-2020 ｰｶ涓ｱ浤ｯｯｵ涓ｯ浤ｯｱｯ Physics II

Principles of Physics (Phy 122) Test_Set_6

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. **

10-02-2001 16:07:00

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:

. . . . . . . . . . . . . . . .

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

Problem Number 1

How much energy is there in the string if it carries a traveling wave with amplitude .95 meters and frequency 491 Hz? The mass density of the string is 17.1 grams/meter, its length is 85 meters and its tension is such that the velocity of a transverse wave in the string is 26 m/s.

How much power does it take to maintain this wave? (Technical Physics and Principles of Physics Students need not answer this part of the question).

Problem Number 2

What are the frequencies of the first four harmonics of a hollow piece of PVC pipe 10 meters long and open at one end? Assume that sound travels in the air inside at the pipe at 344 m/s.

Problem Number 3

Find the wavelength of a wave if 45 equally spaced peaks pass a given point every second, with the wave traveling at 90 meters/second?

Problem Number 4

A microphone is initially 25 meters from a sound source and moving toward it at 39 m/s. The source emits a sound at a constant frequency of 220 Hz.

What sound frequency is therefore received by the microphone?

Assume that sound travels at 340 m/s.

Problem Number 5

A wave whose cycles have period .000011 second travels at velocity 24810 meters/second. What is its wavelength?

Problem Number 6

Problem Number 7

Find the frequency of a wave with whose wavelength is 4 meters and which propagates at the velocity of 44 meters/second.

Problem Number 8 #8: Extra Credit for Physics 122 or Physics 112 (required of others) 122)

A longitudinal wave is traveling along the x axis at 180 m/s with a wavelength of 1.4 m and amplitude of particle motion equal to .26 meters.

Find the equation of motion for a particle at x = 3.3 meters if the wave is driven by an oscillator whose equilibrium position is at x = 0, which is its t = 0 position, and whose t = 0 velocity is positive.

#8: Extra Credit for Physics 122 or Physics 112 (required of others) #8: Extra Credit for Physics 122 or Physics 112 (required of others) #8: Extra Credit for Physics 122 or Physics 112 (required of others)