Time and Date Stamps (logged): 17:12:20 06-10-2020 °¶Ÿ°±Ÿ±¯¯µŸ°¯Ÿ±¯±¯ 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. **

Date and Time are 02-15-2001 16:46:33

Signed by Learning Lab Attendant: ______________________

Date and Time: ______________________

Attendant:

Test is to be taken without reference to text or outside notes.

Calculator is allowed.

No time limit but test is to be taken in one sitting.

Please place test in Dave Smith's folder when completed.

Student:

Completely document your work.

Undocumented and unjustified answers may be counted wrong.

Besides undocument and unjustified answers, if wrong, never get partial credit.

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Problem Number 1

The initial temperature of a system is 119 Kelvin.   As temperature of a system changes the volume changes from 403 liters to 900 liters.   If the system is sealed and held at constant pressure, then  what is the final temperature of the system?

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Problem Number 2

Water is confined to flow through a pipe whose cross-sectional area at point A is greater than that at point B.  At point A the flow speed is 6 m/s and the cross-sectional area of the pipe is .09 m^2.  At point B the cross-sectional area is .015 m^2.  What is the flow speed at pont B?

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Problem Number 3

At a depth of 6.2 meters beneath the surface of a body of water, how much force is exerted by pressure against a rectangle whose dimensions are 8 m by 7.1 m?

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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 510 Joules and if 428.4 Joules of thermal energy are taken out or lost during cooling and other processes, then what is the efficiency of the system?

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Problem Number 5

Water is under pressure 80000 N/m^2 in a tube whose radius is .01 m.  What is the pressure after the tube narrows to radius .005 m, if water in the .01 m part of the tube flows at 1.3 m/s?

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Problem Number 6

What is the average force associated with 46 * 10^6 particles, each of mass 1.9954E-06 Kg, colliding elastically with a wall at a velocity of 103.4 m/s, with directions randomly distributed in 3 dimensions? Assume that the wall is one of the parallel walls of a cylinder, with the walls separated by 95 meters.

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Problem Number 7

If water is filled to a depth of 15 meters above a small hole in a large container, then what will be the PE change of the system as 5 grams of water flows out through the hole?  What therefore will be the KE change of the water, assuming no dissipative forces?  What will therefore be the velocity of the water?

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Problem Number 8

What is the average temperature gradient (i.e., the rate of temperature change with respect to distance) from inside to outside through a wall whose area is 14 m^2, whose thickness is everywhere .17 m and whose inside and outside surfaces are at 131 and 5 Celsius?

What would be the gradient if the temperature difference increased by a factor of 1.595?

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Problem Number 9

It requires 45.24 Joules of energy to increase the temperature of 12 kg of a certain substance by 13 degrees Celsius. What is the specific heat of the substance?