PHYSICS 240 Final--Winter 2001-1

# PHYSICS 240 Final--Winter 2001-1 - I Physics...

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I 1. Physics 240 Winter 2001 Final Exam If you decrease the charge on a parallel-plate capacitor from 9 pC to 3 pC and increase the plate separation from 1 mm to 3 mrr., the energy storcd in the capacitor changes by a factor of A) 1, the stored energy is the same. B) 27 c) 113 D ) e E ) 3 R1 A comparison of the power losses (Py P2, or P3)in the resistors of the circuit in the diagram shows that, if R1 = ^R2 = R3, A) Pr =Pz=P3 B) Pr -P2+P3 C) Pr = G/z)Pz= Q/2)\ D) 4Pt =Pz=P3 E) Pr =2Pz+2P3 The total charge flowing per hour past a given point in a piece of electrical equipment rated at 550 kW and110 V is A) impossible to determine without more information. B) 1.8 x 107 C C) 2.4 x 103 C D) 3.0 x 104 C E) g.g x 104 C ) Page 1

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I /: Physics Z4oWinter 2001 FinalExam The rectangular aluminum strip in the figure is in a uniform magnetic field, B. The cun'ent 1is flowing perpendicular to surface 1. Negative charges will accumulate on sudace 3. surface 1. the surface opposite s;.trface 2. surface 2. none of these surfaces. As you increase the frequency in this circuit flssl lero, A) the impedance will decrease continuously. B) the impedance increases to a maximum and then decreases, C) the impedance decreases to a minimum and then increases. D) the impedance does not change. E) None of these is corect. I / A) B) c) D) E) Page2
, 6 , Physics 240 Winter 2001 FinalExam You dip a wite loop into soapy water (n = 1.33) and hold it up verlically to look at the soap film in white iight. The soap film looks dark at the top because it has sagged, and its thickness there is nearly zeto, causing tlie reflected wavelengths to interfere destructively. Part way down the Ioop yousee the first redband of the reflected white light. What is the thickness of the soap film there? (Take the wavglengrh of red light to be 680 nm.) 340 nm 170 nm 220 nm 130 nm 250 nm 7. Your space vehicle is traveling directly away from the earlh with a speed clL,whercc = 3 x 108 m/s is the velocity of light. A light signal is sent from earth. The speed with whichthis light passes your vehicle, as measured by the space vehicle crew, would be A ) c B) c/(L - rl+1ttz C) cl4 D) 3cl4 E) c/2 8. One of the particles in a cosmic ray shower has a rest energy of 3.0 GeV and a rnomenrum, as measured by an observer on earth, of 4.0 GeV/c. Its kinetic energy, as measured by an observer on earth, is A) 4.0 GeV B) 7.0 GeV C) 2.0 GeV D) 5.0 GeV E) 2J GeY 9. A @!a!e of Einstein's theory of relativity is moving clocks run moreslowly than when they are at rcst. everything is relative, light has both wave and particle properties. the laws of physics must be the same for all observers moving with relative uniform velocities.

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