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Adoww Adq[[ AdZZ\#\# Ad\\ >> Ad AA Ad == :: Ad ] ] AdAA Ad@DOObF n -q)p Physics 1150 Exam #4 December 4, 1995 Name: _________K E Y____ ___________ Possibly useful equations:     s = 5.67 x 108 W/m2 m4    PV/T = PoVo/To = const PV = N kB T kB = 1.38 x 1023 J/K n = m/M N = n NA NA = 6.022 x 1023 PV = n R T R = 8.314 J/mol K Wisobar = P DV Wisotherm = n R T ln[ Vf / Vi ] D Eint = Q W Eff = 1 Tc / Th Eff = W/Qh = (Qh Qc) / Qh = 1 Qc / Qh 273 K = 0C = 32F 100C = 212F CoP = Qc/W (refrig) CoP = Qh/W (heat pump) Fspring = k x PEspring = W = (1/2) k x2 KE = (1/2) m v2       v = f l l= 2L/n fn = n [ v/2L ]  1. How much workin Joulesis done by the gass undergoing the process shown below as it expands from one liter to three liters?  The work done is equal to the area under the curve on a P-V diagram. W = S P DV From the diagram, we can simply count up the area and find that W = 2.5 l-atm Now we must change l-atm into Joules, W = 2.5 l-atm [ 103 m3 / l ] [ 101.3 x 103 N/m2 ] W = 253 N-m W = 253 J2. The part of an A string that vibrates on a particular guitar is 72 cm long. Being an A string, it has a fundamental frequency of 440 Hz when plucked. a) What is the wavelength of the fundamental standing wave in the string? b) What is the wave speed along the string? The length of the string is one-half a wavelength. Therefore, l = 2 x 72 cm = 144 cm = 1.44 m l= 1.44 m v = f l v = (440 1/s ) (1.44 m) v = 634 m/sMultiple Choice: For every question, also consider e) none of the above __b__ 1. In __________ , heat is moved from one atom to the next through a material; there is no bulk movement of the material. a) convection b) conduction c) radiation d) hypothermia __a__ 2. In __________ , he is transferred by the bulk movement of a fluid. a) convection b) conduction c) radiation d) isothermal heat transfer __c__ 3. In __________ , heat is transferred from an object to its surroundings in the form of either infrared or visible light. a) convection b) conduction c) radiation d) ultraviolet cooling __b__ 4. Water can change from liquid to vapor at temperatures below its boiling point; this process is known as a) condensation b) evaporation c) sublimation d) dynamic absorption __c__ 5. Water boils at a) 212 K b) 273 K c) 373 K d) 475 K __c__ 6. Boyles law and Charless law may be combined as a) P V = Po Vo b) V/T = To/Vo c) P V / T = Po Vo / To d) P V / T = Vo To / Po __c__ 7. The ideal gas law is a) F = ma b) P V = ln (Dp/Dt) c) P V = n R T d) Eint = (3/2) N kB T __c__ 8. A constant pressure process is known as a) isothermal b) adiabatic c) isobaric d) isovolumetric __e__ 9. The work done in an isovolumetric process is a) V DP b) n R T ln[ Vf / Vi ] c) n R T ln[ Pf / Pi ] d) n R V ln[ Tf / Ti ] __c__ 10. The efficience of a heat engine may be increased by increasing the a) temperature of its cold heat reservoir b) temperature of its exhaust reservoir c) temperature of its hot heat reservoir d) time for the engine to cool after it is finished running __c__ 11. The potential energy stored in a spring a) depends upon the mass attached to the spring b) is constant c) depends upon the spring constant d) is proportional to how far the spring has been stretched __e__ 12. The period of a simple harmonic oscillator is a) 2 times the frequency b) 2 divided by the frequency c) the frequency divided by 2 d) independent of the frequency __e__ 13. The period of a simple harmonic oscillator is a) one over the amplitude b) proportional to the amplitude c) proportional to one over the amplitude d) proportional to the amplitude squared __d__ 14. The period of a simple pendulum depends upon a) the mass and the length of the string b) the mass and the acceleration due to gravity c) the mass and the amplitude d) the acceleration due to gravity and the length of the string __c__ 15. The amplitude of a simple harmonic oscillator is a) the time for one complete oscillation b) the distance from maximum displacement on one side to maximum displacement on the other side c) the maximum displacement from equilibrium d) the time q from maximum displacement on one sice to maximum displacement on the other side __d__ 16. Antinodes, in a standing wave on a fixed string, are a) both ends b) positions of no movement c) always in the middle d) positions of maximum movement __b__ 17. In a longitudinal wave, the individual movement of the medium is a) always maximum b) along the direction of the motion of the wave c) perpendicular to the direction of the motion of the wave d) undefined __c__ 18. In a transverse wave, the individual movement of the medium is a) always maximum b) along the direction of the motion of the wave c) perpendicular to the direction of the motion of the wave d) undefined __c__ 19. The lowest standing wave frequency is called the a) minimum frequency b) harmonic frequency c) fundamental frequency d) higher overtone frequepncy __c__ 20. Superposition or interference occurs a) for both waves and particles b) only for material particles c) when two waves pass through each other d) when a wave and a particle interact __b__ 21. Beats refers to a) two waves that interfer over a wide area b) two waves that interfer over time c) two particles (like ping-pong balls) that hit each other d) two material objects (like large timbers) that vibrate after hitting __d__ 22. The Doppler effect describes a) microwave ovens b) sonic booms c) loud boom boxes d) sound from moving sources __d__ 23. Sound with frequencies above the normal range of hearing is called a) supersonic b) infrasonic c) megasonic d) ultrasonic __d__ 24. 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