Physics II

Time and Date Stamps (logged): 23:22:06 10-15-2008 ｱｲ浤ｱ浣ｵｰｯ涓ｴ浤ｯｯｷ Physics II

Principles of Physics (Phy 122) Test Sets 51-53

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. **

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

10-02-2001 16:03:30

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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

The region between two capacitor plates contains a uniform electric field of 110000 N/C. How much work is required to move a charge of 1.88 Coulombs through a displacement of .276 m within this region, with the motion parallel to and opposite to the direction of the field?

Problem Number 2

A capacitor with capacitance 7 `microC/Volt is in series with a resistance of 8180000 Ohms and a 49 volt source. When the capacitor holds a charge of 50 `microC, approximately how long will it take it to increase its charge by 1%?

Problem Number 3

If a 2.99 meter length of uniform conducting wire contains 5.1 * 10^18 current-carrying electrons, then if the electrons drift along the wire at .062 m/s, how many electrons per second pass a given point on the wire? What then is the current in amps?

Problem Number 4

A charge of 19 `microC is located at the origin, and a charge of 59 `microC is located at the point ( .46 m,0,0). The first charge is attached to a large mass, so that it can be considered stationary. The second charge is attached to a mass of .0083 kg. Estimate, based on the force at the initial and final points, the work required to move the second charge to the point ( .2576 m,0,0) and the potential energy change associated with moving the second charge to this point

Problem Number 5

A charged object of mass 1.88 kg does -164 J of work against an electric field. If the object carries charge 4 `microC and has initial KE 110 J, and if no force other than the force of the field acts on the charge, what will be its final kinetic energy and speed?