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by: Mrs. Peter Toy


Mrs. Peter Toy

GPA 3.96

Michael Ritzwoller

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About this Document

Michael Ritzwoller
Class Notes
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This 13 page Class Notes was uploaded by Mrs. Peter Toy on Friday October 30, 2015. The Class Notes belongs to PHYS 2010 at University of Colorado at Boulder taught by Michael Ritzwoller in Fall. Since its upload, it has received 14 views. For similar materials see /class/232094/phys-2010-university-of-colorado-at-boulder in Physics 2 at University of Colorado at Boulder.




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Date Created: 10/30/15
Remember You should have nished reading Chs 134 CAPA assignment 3 is due this evening at 10 PM to be done onIine Midterm exam 1 is next Tuesday from 730 900 PM Students with documentation who need extra time should see Prof Parker after class today Materials to study for Mid Term I Read Giancoli Chl Ch 3 4 In class Clicker Questions amp Lecture Materials Your CAPAs Your Tutorials and Lab 39 Written HWs Giancoli web site Practice Questions MCAT Study Guide Practice Problems Link on course web site Sampling of end of chapter Questions and Problems Old practice exam on course web site Dr Michael Dubson s Chapter Notes Last time Expressing motion in 2D Reviewed vectors length magnitude and direction Expressing vectors in component form Finding length of a vector Finding components of a vector requires tri Finding the direction from the components more trig Review of trigonometry Addition amp subtraction of vectors by components amp graphically De nition of position displacement amp velocity vectors Kinematics in 2D Use of Vectors Speed vs Velocity in 2D Velocity E At V displacement elapsed time distance traveled S Speed elapsed time Vector magnitude amp direction Scalar magnitude Kinematics in 2D Use of Vectors Speed vs Velocity in 2D V610 C ity E d1splacement At elapsed time w 39 Scale for velocity distance traveled 1 cm 90 kmh SPGGd S elapsed time Velocity is changing but speed is constant Copyright 2005 Pearson Prentice Hall Inc An object travels from point 0 back to point 0 in 1 hour along an equilateral triangle in which each side is 10 km as follows gt IAI IEI10km What is the object s average speed around the loop Q A 0 kmh C B 10 kmh C 20 kmh s 2 distance traveledelapsed time D 30 kmh 2 3O kml hr 30 kmh E 40 kmh Phys 2010 Friday 42007 Waves and Sound 7 Chapters 1112 httpphet Colorado edu 2 radio waves Waves carry information from one place to another Radio waves electromagnetic not sound Sound waves move through air Waves on the surface of water Particles behave as waves Similar properties amplitude energy and a wavelength that depends on frequency and speed Wave Terminology 1 Medium The material that oscillates bobs up and down People water air for sound waves strings Medium does not move with the wave energy Propagate to travel through space or a material A wave quotpropagatesquot along the medium A wave travels along the medium Wave Terminology 2 Transverse wave Medium oscillates perpendicular to direction wave va ls Waves on a string light waves radio waves quotriie Wavequot at a ball game Langifudinal waves Medium oscillates parallel to irection wave travels sound people josTling standing on aTmin some slinkys li39l39 39 39l39l39li39l39lliilimimi Wave Terminology 3 Pulse A single disTurbance ThaT propagaTes along The me turn Jam isTurbance ThaT repeats 39 d39c wave A d ver Pa m I iTseIf over and o A rope is wiggled Iik his Which correcTIy shows The movemenT o poinT 1 on The rope as Time progresses Wave Terminology 4 Wavelengfh A The lengTh of one cycle of a wave o 393 Amplifude A The maximum displacemenT of The medium from iT39s equilibrium posiTion Measured from neufral These waves all follow The formula yXtAsin2 L T Which has The largesT ampliTude Physical Effects ofAmplitude A LighT Waves Low ampliTude dim Sound Waves Low ampliTude quieT High ampliTude loud Wave Speed V I v AxA l39 in me l39er39ssecond I measure of how fos r he disur39bcxnce is moving from one posiion o ono rher39 along he mediu NOT how fos r he wave is vibr39cri39ing I WAVE SPEED DEPENDS ON THE MEDIUMH Wave speed on c sr39ing depends on ension densiy Speed of sound in air depends on emper39cri39ur39e densiy Ligh r r39cxvels more slowly hr ough gloss wcri39er39 hon air Two drums are bea l39 a1quot he same ime sound reaches he Iis l39ener39 firs1quot Cool Air AJ F Wave Terminology 6 Frequency f Cyclessecond Her2 or Hz Per iod Time for one cycle seconds f 1T Lower Frequency Higher Fre quency WAVE FREQUENCY DEPENDS ON THE VIBRATION RATE OF THE SOURCE Frequency is independen i39 of he wave speed Physical Effects of Frequency Color amp Pitch Lighf Waves IR UV Lower frequency Higher frequency Lower frequency Higher frequency Wave speed v uniTs are meTerssecond Frequency 1 uniTs are cyclessecond WavelengTh A uniTs are meTerscycle Which relationship is correcT AfV7v BAfv CVf7v DfAv Wave speed v depends on The medium ThaT carries The wave Frequency 1 depends on The raTe of vibraTion of The source WavelengTh A depends on speed and frequency Which of These depend on The ampIiTude A v B 1 C A D None of These The oscillating string has potential and kinetic energy t w ich point isthe magnitude o potential energy maximum E Two or more points Which point has maximum kinetic energy Do points A and D have different kinetic energies A Yes B No What do waves carry from one place to another A People B Water a Airmolecules D EnergyInformation E All of the above The graph shows a snapshot of a wave on a string traveling to the right At the instant shown the velocity of point P is in which direction I which direction is n the acceleration of P E None of these all other conditions are the same sound waves trevei fastest when produced by which instrument D Same for all If all other conditions are the same which instrument produces the highest D Same for all If same medium these waves travel at the same speed but a higher frequency produces a shorter wavelength


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