Physics II

Time and Date Stamps (logged): 03:52:11 08-29-2008 ｯｲ浙ｱ涓ｰｯｷ浤ｸ浤ｯｯｷ Physics II

Principles of Physics (Phy 122) Test_Set_5

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 15:31:23

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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

Water flows at 2.2 m/s through a tube whose radius is .15 m. The tube then narrows to radius .075 m. If the pressure in the first tube is 160000 N/m^2, then what is the pressure in the second?

Problem Number 2

What will be the change in the pressure of water between point A, where velocity is 4.2 m/s, and point B, where velocity is 3.5 m/s, provided the water is confined, points A and B are at the same altitude, and there are no dissipative forces at work?

Problem Number 3

What is the specific heat of a substance if it requires 106.02 Joules of energy to increase the temperature of 9 kg of the substance by 38 degrees Celsius?

Problem Number 4

A system consisting of a cylinder full of gas, sealed by a piston, is alternately loaded, heated, unloaded and then cooled back to its original state. If heating requires 70 Joules and if 61.6 Joules of thermal energy are taken out or lost during cooling and other processes, then what is the efficiency of the system?

Problem Number 5

If the pressure at a depth of 5.2 meters in water is 50960 N/m^2, then how much force will there be on a rectangle whose dimensions are 7 m by 8.1 m?

Problem Number 6

Each of the particles in a container has a velocity which is always directed parallel to the axis of the container and perpendicular to its ends. Each particle has mass 9.079072E-07 Kg, and constant velocity 101.9 m/s. The round-trip time between collisions with a certain wall is .14 seconds. What is the average force exerted on the wall by the particles?

Problem Number 7

Water is filled to a depth of 10 meters above a small hole in a large container. Use energy conservation to determine the velocity of 3 grams of water as it flows out through the hole, provided there are no dissipative losses.

a=fnf(2,20,1) b=fnf(3,9,1) c=b/1000 d=c*9.8 e=d*a f=fng(2*e/c)

Problem Number 8

What Celsius temperature of a closed and sealed system, held at constant volume, will result in a pressure of 286.4 kN/m^2 if the pressure of the system is 242.6 kN/m^2 when the temperature is 125 Celsius?

Problem Number 9

A wall has inside temperature 136 Celsius and outside temperature 3 Celsius. Its area is 4 m^2 and its uniform thickness is .2 m. What is the temperature gradient from inside to outside?

If the inside temperature decreased, thereby increasing the temperature difference by a factor of 1.265, what would be the temperature gradient?