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# GENERAL PHYSICS 1 PHYS 2010

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This 11 page Study Guide was uploaded by Mrs. Peter Toy on Friday October 30, 2015. The Study Guide belongs to PHYS 2010 at University of Colorado at Boulder taught by Staff in Fall. Since its upload, it has received 24 views. For similar materials see /class/232106/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

CTWavesl Is quotThe Wavequot at the stadium a transverse wave or a longitudinal wave A Transverse B Longitudinal C neither Answer Transverse People waves their arms up and down while the wave moves right or left across he stadium CTWaves2 A wave on a stretched drum head is an example of a A Transverse wave B Longitudinal wave C it s not a wave at all A transverse A drum head is like a 2dimensional string The wave on a drum head like a wave on the surface of water moves along the surface while the atoms of the drumhead move perpendicular to the surface CTWaves3 The graph below shows a snapshot of a wave on a string which is traveling to the right There is a bit of paint on the string at point P y Vwave P A A At the instant shown the velocity of paint point P has which direction B Dlt gt l C E None of these At the instant shown the acceleration of the particle has which direction Same choices Answers At the instant shown the point P is moving downward as shown in the diagram Its acceleration is also downward because the motion of a point of paint is sinusoidal and is exactly the same as the motion of a mass on a spring simple harmonic motion y V CTWaves4 Two traveling waves 1 and 2 are described by the equations y1 X t 2 sin2X t y2 X t 4 sinX 2t All the numbers are in the appropriate SI mks units Which wave has the higher speed A 1 B 2 C Both have the same speed The wavelength 7 of wave 1 is most nearly A 1m B 2m C 3m D 4m The period of wave 2 is most nearly A1s B2s C3s D4s Answers Wave 2 has twice the speed of wave 1 I can write wave 1 as y1 2 sin2X 7 12t Comparing with the form yXt Ysin x vtll J we see that the speed ofwave 1 is 05 ms while the speed ofwave 2 is 2 ms The wavelength of wave 1 is most nearly 3m Comparing yl 2 sin2X 7 t yXt Ysin pg we see that 2 211 because the thing multiplying the X is 2117 So we must have 7 11 which is close to 3 The period of wave 2 is most nearly 3 s I Comparing yz 4sinX 7 2 t yXt Ysin pg we see that 2 2111quot because the thing multiplying the t is 2111quot So we must have T 11 which is close to 3 CTWaves5 Three waves are traveling along identical strings same mass per length same tension same everything Wave B has twice the amplitude of the other two Wave C has a slightly has 12 the wavelength than A or B Which Wave goes slowest A B C D All have same v Vwave Which wave A or C has the higher frequency A C Answers All three waves are on identical strings so the wave speeds are all the same The speed of a wave depends only on the properties of the medium the string not on the properties of the wave wavelength and frequency do not affect wave speed C has higher frequency than A It is always true that vwave 7 f so a smaller wavelength implies a larger frequency since the wave speed is constant CTWaves6 X t These waves are describes by YX t Y 5m 27 I Which ofthese waves has the largest amplitude Y A B or C V A A V V y BX vvvvvv C WUBUWWX V Answer B has the larger amplitude CTWaves7 A string is clamped at both ends and then plucked so that it vibrates in a standing mode between two extreme positions A and C Let upward motion correspond to positive velocities When the string is in position B the instantaneous velocity of points along the string is A zero everywhere B positive everywhere C negative everywhere D depends on the position A A wE w r V C When the string is in position C the instantaneous velocity of points along the string is same choices Answers At position B instantaneously at different parts of the string are moving with different velocities nodes aren t moving at all some of the antinodes are moving upward some antinodes are moving downward At position C the extreme position all parts of the string are in the process of turning around changing from moving away to moving toward equilibrium so all parts of the string are instantaneously at rest CTWaves8 The air pressure inside the Space Station is p 12 pounds per square inch There are two square windows in the Space Station a little one and a big one The big window is 30 cm on a side The little window is 15 cm on a side How does the pressure on the big window compare to the pressure on the little window Please do not open windows A same pressure on both windows B 2 times more pressure on the big window C 4 times more pressure on the big window D 9 times more pressure on the big window E None of these Answer There is the same pressure 12 psi on both windows The bigger window has a bigger area A and a bigger force F but it has the same force per area FA CTWaves9 When you turn up the volume on your sound system A the speaker cone oscillates back and forth more rapidly completing more cycles per second B the speaker cone oscillates back and forth more slowly completing fewer cycles per second C the speaker cones oscillates back and forth farther in each cycle D the speaker cones oscillates back and forth a shorter distance in each cycle E None of these Answer the speaker cones oscillates back and forth farther in each cycle CTWaves 10 A musician playing a perfect quotconcert Aquot tone f 440Hz on his horn is standing on the back of a fastmoving pickup truck which drives by a listener standing on the sidewalk The truck has constant velocity truckridin hornplayer E O listener Which graph below most accurately shows the frequency heard by the listener vs time f f A Answer B RIIIl Phys2010 Exam 3 Review Chapter 6 Work and Energy 0 work done by force F WF FH d work can be or zero 0 workenergy principle W AKE net 0 If no thermal energy generated Emech KEPE constant 0 If thermal energy generated KE PE Emermal constant 0 Hooke39s Law Fspring k X k spring constant o PEgm m g h PEelas c 12 k x2 AW At 0 Power P Chapter 7 Momentum 0 Conservation of momentum for system isolated from outside forces 15 mlvl 1115 constant 0 Impulse Af 13net At 0 elastic vs inelastic collisions KE is conserved only in perfectly elastic collisions Chapter 8 Rotations Notice analogy between rotation about a xed axis and 1D translation along the XaXis o 9rads E mA e aamp like X v a r At At At At 0 vroa awn rat 0 torque I El rFi o moment of inertia I 21min2 o EnetI39OL likanetma o KEmmio 12 I 032 like KEm 12 mvz 0 Rolling motion KEm KELmns KErm m v2 1 m2 RIH2 Angular momentum L I 03 like linear momentum p mv Angular momentum of an isolated system is conserved Remember to solve any beforeafter problem try conservation of energy or conservation of momentum or conservation of angular momentum Energy or momentum or angular momentum only conserved if system is isolated Conservation of linear momentum useful for collision problems even if thermal energy is generated Momentum is conserved regardless of whether collision is elastic or inelastic Conservation of mechanical energy KE PE useful only if no sliding friction or inelastic collisions so no thermal energy generated Conservation of angular momentum useful for isolated rotating systems To prepare for Exams Review Concept Tests and CAPA problems Read question and try to remember reasoning that gets to the answer Prepare your formula sheet Take the practice exam It is no good to memorize answers You have to understand and remember how you construct the answers RIIIl Phys2010 Exam 3 Review Chapter 6 Work and Energy 0 work done by force F WF FH d work can be or zero 0 workenergy principle W AKE net 0 If no thermal energy generated Emech KEPE constant 0 If thermal energy generated KE PE Emermal constant 0 Hooke39s Law Fspring k X k spring constant o PEgm m g h PEelas c 12 k x2 AW At 0 Power P Chapter 7 Momentum 0 Conservation of momentum for system isolated from outside forces 15 mlvl 1115 constant 0 Impulse Af 13net At 0 elastic vs inelastic collisions KE is conserved only in perfectly elastic collisions Chapter 8 Rotations Notice analogy between rotation about a xed axis and 1D translation along the XaXis o 9rads E mA e aamp like X v a r At At At At 0 vroa awn rat 0 torque I El rFi o moment of inertia I 21min2 o EnetI39OL likanetma o KEmmio 12 I 032 like KEm 12 mvz 0 Rolling motion KEm KELmns KErm m v2 1 m2 RIH2 Angular momentum L I 03 like linear momentum p mv Angular momentum of an isolated system is conserved Remember to solve any beforeafter problem try conservation of energy or conservation of momentum or conservation of angular momentum Energy or momentum or angular momentum only conserved if system is isolated Conservation of linear momentum useful for collision problems even if thermal energy is generated Momentum is conserved regardless of whether collision is elastic or inelastic Conservation of mechanical energy KE PE useful only if no sliding friction or inelastic collisions so no thermal energy generated Conservation of angular momentum useful for isolated rotating systems To prepare for Exams Review Concept Tests and CAPA problems Read question and try to remember reasoning that gets to the answer Prepare your formula sheet Take the practice exam It is no good to memorize answers You have to understand and remember how you construct the answers

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