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Iowa Central Community College - ENG - Speech
Caitlin SwanbergMiss SchumanEnglish 25025 March, 2011SacrificeThroughout history, sacrifice meant giving up something to the gods. However, sacrificecan mean anything from losing your first born to giving up time to meet with a client. In eithercas
Iowa Central Community College - ENG - Speech
Caitlin SwanbergMs. SchumannEnglish 250February 17, 2011The Life of PovertyThe four hobo corners of the Maplewood Mall in Minnesota are marked by a homelessperson staking their spot with a cardboard sign. I drive by these corners often solely thinki
Iowa Central Community College - PHYSICS - 222
Lecture 18Superconductivity (100 years since the discovery)will be presented by Professor Ruslan Prozorovlecture slides will be posted athttp:/course.physastro.iastate.edu/phys222/Lectures%20(Prozorov)/Prozorov_18.pdf
Iowa Central Community College - PHYSICS - 222
12b. EMF induced in a moving conductorA = lx = lvtvlBAx = vtBBA ==tt = Blv1) What is polarity of EMF ?2) What would be the direction of the inducedcurrent, if rod slides on a conducting track ?The B field points out of the page. The flux
Iowa Central Community College - PHYSICS - 222
Physics 222 SyllabusFall 2011LecturerLecture hours:Office hours:LecturerLecture hours:Office hours:Prof. Ruslan Prozorovprozorov@iastate.eduMWF 1:10-2:00MWF 2:10-3:00Tuesday 2 PM 3:30PMA119 Zaffarano294-9901Dr. Anatoli Frishman210 Physics
Iowa Central Community College - PHYSICS - 222
19. LC circuitsKirchhoffs loop rule:Cv = q/CL inddid 2q= L = L 2dtdtvC = ind qd 2q= L 2 Cdtd 2q+ 2q = 0dt 2Solution:d 2qq+=02LCdt=1LCq = Q cos( t + )i = Q sin ( t + )vC = ( Q / C ) cos( t + )Important: current and potent
Iowa Central Community College - PHYSICS - 222
22. AC current1) General ideasR2 = 2f =TLC2) Phasor diagramsV length of phasortvR ( t ) ?vC ( t ) ?vL ( t ) ?v( t ) = V cos tV sin ti( t ) ?phasorV cos t23. AC circuits and reactance1) Resistori ( t ) = I cos tv( t ) = i ( t ) R = IR
Iowa Central Community College - PHYSICS - 222
24. LRC series circuit1) ImpedanceCurrent i(t) is the same in allelements of the series circuit.RLv( t )Note! There is no current inside the capacitor,but we can apply Kirchhoffs rules taking intoaccount displacement currentCv R = VR cos ti (
Iowa Central Community College - PHYSICS - 222
26. Electromagnetic waves1) Maxwells equations and electromagnetic waves2) Properties of electromagnetic wavesSpeed of light:1c= 3 108 m / s 0 0cWave length: =fPolarization of EM waves:EEThis wave is polarized in y directionvBxzBe.m. w
Iowa Central Community College - PHYSICS - 222
ConcepTest 22.2ConcepTestThe electric field in an EMwave traveling northeastoscillates up and down. Inwhat plane does themagnetic field oscillate?OscillationsOscillations1) In the north-south plane.In2) In the up-down plane.In3) In the NE-SW
Iowa Central Community College - PHYSICS - 222
7) Energy in electromagnetic wavesEnergy density:dU 1B22u== 0E +dV 22 0B = E/cfor e.m. wavefor any e.m. fieldU B2u= == 0E2V 0(U energy, V - volume)Poynting vector:Traveling EM waves transport energy. This energy transport can be describe
Iowa Central Community College - PHYSICS - 222
IV. OpticsNature of light. Spectrum of electromagnetic waves.Wavelength decreases Frequency increases Note: 1 nanometer = 10-9 meterA. Geometric optics1. Wave front and raysrayswave fronts2. Reflectioninnormal tosurfaceout1 21 = 2diffuse r
Iowa Central Community College - PHYSICS - 222
7. Spherical mirror1) Mirror equationCdohhhh < <1 ; ; d0diR = + = + + = 2 diif d i d o R 2 = fif d o d i R 2 = fExample:112+=d0 di R111+=d0 di fR = 1.0m121215. 0===d i R d 0 1.0m 3.0m 3.0md o = 3. 0 mdi =di ?3.0= 0.6m
Iowa Central Community College - PHYSICS - 222
8. Thin lensesThin lenses are those whose thickness is small compared to their radius ofcurvature. They may be either converging or diverging.1) Types of lensesExample: An air bubble in a piece of glasshas a double convex shape (see below).What type
Iowa Central Community College - PHYSICS - 222
e = 1.60 10 19 C ; me = 9.11 10 31 kgF =kk=V1 = V2 = . = VQ1Q2r21= 8.99 10 9 N m 2 / C 24 0 0 = 8.85 10 12 C 2 / N m 2Fnet = F1 + F2 + .F = qEE net = E1 + E 2 + ._ E = d E = E cosdA = EdA dEC eq = C1 + C 2 + .= 4kQencl = Qencl 0Q4 0 r
Iowa Central Community College - PHYSICS - 222
13. Comments about the induced electric field(nonelectrostatic field)For electrostatic field: Edl = 0When a charge goes arounda closed loop work is equalto zeroW =0Electrostatic field is conservativeElectric field lines donot form closed loopsF
Iowa Central Community College - PHYSICS - 222
Two questions:(1) How to find the force, F on the electric charge, q excreted by the field E and/or B?F = qE + qv B(2) How fields E and/or B can be created?Maxwells equationsGausss law for electric fieldElectric charges create electric field: E E
Iowa Central Community College - PHYSICS - 222
Lecture 15Review for Exam 1 (see lectures 1-14)No slide show - problems will be solved on the board
Iowa Central Community College - PHYSICS - 222
Lecture 14 will be presented by Professor Ruslan Prozorovlecture slides can be found athttp:/course.physastro.iastate.edu/phys222/Lectures%20(Prozorov)/Prozorov_14.pdf
Iowa Central Community College - PHYSICS - 222
ConcepTest 20.8a Magnetic Field of a Wire IMagnetic1) direction 1If the currents in these wires have2) direction 2the same magnitude, but opposite3) direction 3directions, what is the direction of4) direction 4the magnetic field at point P?5) th
Iowa Central Community College - PHYSICS - 222
8. Magnetic field of moving charge1) What is the problem with moving charge?2) For v=0 and a=0:(Coulombs law)3) ForqrE=k 2rr1k=4 0v=0 and a=0:()1 v2 c2 ( r r v c)E = kq( r r v c) 3Speed of light:4) ForB=0(c2 =v<c and a=0: 0 qv rB=
Iowa Central Community College - PHYSICS - 222
vdAnNlA5. Magnetic forces on currentF = qv BlN nlAlv d = l v dF = Ftot = Nqvd B= nlAqvd B= nqAvd l B F = Il BnqAvd = I - angle between vd and BdF = Idl BF = IlB sin dF = IdlB sin Example: A straight wire carrying a current is placed i
Iowa Central Community College - PHYSICS - 222
III. Magnetism1. Electromagnetism in the laboratory and around us2. Electromagnetism is simple. (If you know what it is!)It is about:q - electric charges(magnetic charges do not exist)F - electromagnetic forcesE - electric fieldsB - magnetic field
Iowa Central Community College - PHYSICS - 222
Resistors in series and in parallel (review)IR1V1I = I1 = I 2I1R2IV2VII2V = V1 + V2I = I1 + I 2Req = R1 + R2ExampleR1 = 12VR1R2ER2 = 3012VI=== 0.26 AR1 + R1 + r 47V = V1 = V2111=+Req 15 30Req = 10rReq = 15 + 30R2111
Iowa Central Community College - PHYSICS - 222
12. RC circuitsi1) Charging capacitor = iR + vCdqq=R+dtCdqq+=dt RC R RCR(q = Q 1 e t / RCQ = CvC =C)(vC = 1 e t / RCV = i = I 0 e t / RCI0=R)qC2) Discharging capacitordqq+=dt RC Rq = q 0 e t / RC =0 RCvC = V0 e t
Iowa Central Community College - PHYSICS - 222
8. Power in electric circuitsIRVW QVP== IVttW = QVQ=ItV = IR2VP = IV = I R =R[ P] = 1W = 1V A = (1J / C ) (1C / s ) = 1J / s2Example: Two resistors, R1 = 5 , R2 = 10 , are connected in series.The battery has voltage of V = 12 V.a) F
Iowa Central Community College - PHYSICS - 222
6. Capacitance and capacitors6.1 Capacitors+Q+Q-Q+Q-QSymbol:6.2 CapacitanceDefinition:QC=VUnits:[C]= 1 F = 1 C / VV V V+ VC is independent from: Q and V (V is always proportional to Q)C depends on:the geometry of the systemthe dielectri
Iowa Central Community College - PHYSICS - 222
Two questions:(1) How to find the force, F on the electric charge, q excreted by the field E and/or B?F = qE + qv B(2) How fields E and/or B can be created?Maxwells equationsGausss law for electric fieldElectric charges create electric field: E E
Berkeley - EE - 221A
EE221A Linear System TheoryProblem Set 1Professor C. TomlinDepartment of Electrical Engineering and Computer Sciences, UC BerkeleyFall 2007Issued 9/4; Due 9/13Problem 1: Fields.(a) Dene addition and multiplication on cfw_0, 1 to form a eld. Show th
Berkeley - EE - 221A
EE221A Linear System TheoryProblem Set 2Professor C. TomlinDepartment of Electrical Engineering and Computer Sciences, UC BerkeleyFall 2007Issued 9/18; Due 9/27Problem 1: Useful properties of eigenvalues. Let A Rnm , B Rmn and let n m. Observe that
Berkeley - EE - 221A
EE221A Linear System TheoryProblem Set 3Professor C. TomlinDepartment of Electrical Engineering and Computer Sciences, UC BerkeleyFall 2007Issued 9/27; Due 10/4Problem 1: Dynamical systems, time invariance.Suppose that the output of a system is rep
Berkeley - EE - 221A
EE221A Linear System TheoryProblem Set 4Professor C. TomlinDepartment of Electrical Engineering and Computer Sciences, UC BerkeleyFall 2006Issued 10/9; Due 10/18Dear 221A folks: Some problems like the ones below may be included on the midterm on Oct
Berkeley - EE - 221A
EE221A Linear System TheoryProblem Set 5Professor C. TomlinDepartment of Electrical Engineering and Computer Sciences, UC BerkeleyFall 2007Issued 10/23; Due 11/1Problem 1.Suppose A Cnn is such that det(A) = 0. Is det(eA ) = 0? Explain why or why no
Berkeley - EE - 221A
EE221A Linear System TheoryProblem Set 6Professor C. TomlinDepartment of Electrical Engineering and Computer Sciences, UC BerkeleyFall 2007Issued 11/6; Due 11/15Problem 1: Sti Dierential Equations.In the simulation of several engineering systems we
Berkeley - EE - 221A
EE221A Linear System TheoryProblem Set 7Professor C. TomlinDepartment of Electrical Engineering and Computer Sciences, UC BerkeleyFall 2007Issued 11/15; Due 11/27Problem 1. Show thatA0c0,b0where A Rnn , b Rn , cT Rn is completely controllable
Berkeley - EE - 221A
EE221A Linear System TheoryProblem Set 8Professor C. TomlinDepartment of Electrical Engineering and Computer Sciences, UC BerkeleyFall 2007Issued 11/27; Due 12/6Problem 1: State vs. Output Feedback.Consider the plant described by:XywhereA=07
Berkeley - EE - 221A
EE221A Linear System TheoryProblem Set 9Professor C. TomlinDepartment of Electrical Engineering and Computer Sciences, UC BerkeleyFall 2007Issued 12/4; Due 12/15221A folks: Homework 9 is due at the nal exam. However, if youd like to hand in your hom
Berkeley - EE - 221A
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Berkeley - EE - 221A
EE221A Linear System TheoryFinal ExamProfessor C. TomlinDepartment of Electrical Engineering and Computer Sciences, UC BerkeleyFall 201012/14/10, 3-6pmYour answers must be supported by analysis, proof, or counterexample.There are 9 questions: Pleas
Berkeley - EE - 221A
EE221A Linear System TheoryMidterm TestProfessor C. TomlinDepartment of Electrical Engineering and Computer Sciences, UC BerkeleyFall 200710/16/07, 9.30-11.00amYour answers must be supported by analysis, proof, or counterexample.There are 6 questio
Berkeley - EE - 221A
EE221A Linear System Theoryhttp:/inst.eecs.berkeley.edu/ee221a/Course OutlineProfessor C. TomlinDepartment of Electrical Engineering and Computer SciencesUniversity of California at BerkeleyFall 2011Lecture InformationLectures: TuTh 9.30-11, 521 C