Time and Date Stamps (logged): 01:47:14 08-29-2008 ¯°Ÿ³¶Ÿ°³¯·Ÿ±¸Ÿ±¯¯· Physics II

Principles of Physics (Phy 122) Final Exam

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. **

10-03-2001 20:40:46

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Instructions:

Directions for Student:

Test Problems:

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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

 

 

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Problem Number 1

Suppose that a closed system with constant number of moles of a gas and a constant volume has pressure 206.7 kN/m^2 when the temperature is 170 Celsius. What Celsius temperature will result in a pressure of 238.7 kN/m^2?

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Problem Number 2

If a wave with 4 meters between peaks passes at the velocity of 20 meters/second, then how many peaks pass in a second?

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Problem Number 3

If water flows at 9 m/s through a tube whose cross-sectional area is .04 m^2, then what will be the flow speed if the tube narrows to cross-sectional area 1.333333E-02 m^2?

a = fnf(2,10,1)

dumby = fnf(1,20,1)

b = dumby / 100

dummy=fnf(2,6,1)

c = b / dummy

vbl1 = b / c

cor = vbl1 * a

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Problem Number 4

What will be the force on an electron (mass approximately 9 * 10^-31 kg, charge -1.6 * 10^-19 C) as it moves in the horizontal direction at velocity 2.5 * 10^6 m/s within a uniform magnetic field of .0067 Tesla directed vertically upward? What will be the radius of curvature of its path? Describe its path. What would be the radius of curvature for a proton (mass approximately 1.6 * 10^-27 kg) moving at the same velocity? Describe specifically how its path would differ from that of the electron.

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Problem Number 5

What is the thermal conductivity k of a material if a wall of the material with area 19 m^2, whose thickness is .22 m and whose inside and outside walls are at 184 and 17 Celsius, conducts thermal energy at the rate of 75.5 watts? 

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Problem Number 6

A certain hypothetical atom contains 73 protons and 100 neutrons in its nucleus and has an atomic mass of ( 173 - .031 ) atomic mass units, or amu (an amu is approximately 1.66 * 10^-27 kg; a proton mass is about 1 + .00073 amu, neutron mass about 1 + .00087 amu). What is the mass defect of this atom? What is the energy equivalent of the mass defect of a mole of these atoms?

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Problem Number 7

What are the magnitude and the direction (in degrees) of the electric field at the point (-11.01 m,-19.01 m), due to a charge of 4 `microC at (-1.011 m,-11.02 m)?

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Problem Number 8

What is the electrostatic flux of a field of magnitude 2.2 N/C through a circular region with radius 5.1 meters, if the field makes an angle of 14 degrees with a perpendicular to the plane of the region?

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Problem Number 9 122)

A transverse sine wave propagates in the x direction at 26 m/s, with each particle following exactly the same path from one cycle to the next. The frequency of the wave is 269 Hz, and its amplitude (the maximum distance of a particle from its equilibrium position) is .27 meters.

What is an equation of motion for the particle at position x = 8.5, assuming that the x=0 particle has equation of motion y = A sin(`omega t) for the appropriate amplitude A and angular frequency `omega.

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Problem Number 10

If the resistance of a circuit is 31 ohms and a voltage of 6 volts is applied, then how much current will flow in the circuit, and how much power will be required to maintain the current?

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Problem Number 11

We refer to the number of volts / meter (or alternatively the number of Newtons/Coulomb) at a point as the electric field strength, or the magnitude of the electric field, at that point.

In a certain region, the electric field is uniformly equal to 77 volts / meter. Find

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Problem Number 12

Find the strength of the magnetic field due to a straight current segment of length .043 m, at a distance of 5.9 meters from the segment, provided that the vector from the segment to the point is perpendicular to the segment, and that a current of 3.5 Amps flows in the segment.

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Problem Number 13

Suppose an electron could orbit a proton at a constant distance of 1.94 Angstroms, with the the centripetal force coming from the Coulomb attraction between proton and electron.

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Problem Number 14

A sound source is moving toward a microphone at 15 m/s, emitting sound at a constant frequency of 800 Hz (i.e., 800 pulses per second).  Sound travels at about 340 m/s.

If the source starts out 35 meters from the microphone, then how long does it take the first sound pulse to reach the microphone, and how long does it take the source to reach the microphone?

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Problem Number 15

A capacitor holds charge 8 `microC/Volt. It is in series with a resistance of 26 Ohms.

The capacitor is charged to 50 `microC, then the source is removed and the circuit again closed, allowing the capacitor to discharge through the resistor.