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_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 15:31:32

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

The velocity of a confined fluid of density 1000 kg/m^3 changes from 8.6 m/s to 5.5 m/s with no change in altitude, and with no dissipative forces at work. What will be the change in pressure?

Problem Number 2

A uniform cylinder of cross-sectional area 45 square meters is filled with water to a depth of 90 meters above its outflow valve.

By how much does the potential energy of the system, as measured with respect to the outflow valve, increase if water is pumped in from the level of the outflow valve until the depth increases to 90.5 meters?

If water is then allowed to flow from the cylinder through the small outflow valve until the water returns to its original level, what will be the total kinetic energy of the outflowing water and what will be its average speed, assuming no dissipative losses?

Solve this problem by energy considerations only. Then solve using Bernoulli's Equation.

Problem Number 3

If the pressure at a depth of 5.6 meters in water is 54880 N/m^2, then how much force will there be on a rectangle whose dimensions are 4 m by 4.1 m?

Problem Number 4

A calorimetry experiment indicates that 651.75 Joules of energy are required to increase the temperature of a 15 kg sample of the substance by 55 degrees Celsius. What is the specific heat of the substance?

Problem Number 5

Find the efficiency of a heat engine does 77.5 Joules of work and from which 232.5 Joules of thermal energy are removed or dissipated during a cycle.

a = fnf(10,1000,10)

dummy = fnf(.5,.99,.01)

b = a * dummy

c = a - b

vbl1 = b + c

cor = c / vbl1

Problem Number 6

A wall conducts thermal energy at the rate of 73.1 watts. The wall has cross-sectional area 16 m^2, thickness .36 m and inside and outside temperatures 186 and 30 Celsius. What is the thermal conductivity of the material of which the wall is composed?

Problem Number 7

The particles in a cylindrical container have velocities randomly distributed in 3 dimensions. The container contains 4500 * 10^6 particles, each of mass 4.090571E-06 Kg. Assume that the particles always have a uniform velocity of 102.6 m/s. The particles collide with a wall which is one of the parallel walls of a rectangular 'box', separated by 15 meters from its counterpart. What is the average force exerted on this wall?

Problem Number 8

Water is under pressure 150000 N/m^2 in a tube whose radius is .19 m. What is the pressure after the tube narrows to radius .095 m, if water in the .19 m part of the tube flows at 2.9 m/s?

Problem Number 9

A closed system is sealed so that no gas can enter or leave the system. The system is held at constant temperature.

The system is observed to have a pressure of 103.1 kN/m^2 when its volume is 1.39 m^3. What is the pressure when the volume is increased to 5.143 m^3?.