Class Note for PH 102 with Professor Harrell at UA-Generl Physics II (2)
Class Note for PH 102 with Professor Harrell at UA-Generl Physics II (2)
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This 5 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at University of Alabama - Tuscaloosa taught by a professor in Fall. Since its upload, it has received 15 views.
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Date Created: 02/06/15
Name UNIVERSITY OF ALABAMA Department of Physics and Astronomy PH 102 1 LeClair Summer ll 2008 Exam I Instructions 1 Answer all questions below All problems have equal weight 2 Clearly mark the answer you choose using the tick boxes 3 There will be no partial credit given 4 You are allowed 2 sides of a standard 85Xll in piece of paper with notesformulas and a calculator 1 An electron is released a short distance above the surface of the Earth A second electron directly below it exerts an electrostatic force on the rst electron just great enough to cancel the gravitational force on it How far below the rst electron is the second D 51m D 75m D 102m D 25m 2 A point charge 4 is located at the center of a spherical shell of radius a that has a charge iq uniformly distributed on its surface Find the electric eld for a point a distance 7 gta from the center of the shell a outside the sphere DEkTA DE k q 47r7 DE0 152 DE T3 3 Calculate the speed of a proton that is accelerated from rest through a potential difference of 130 V D 321X104ms D 79 X 104 ms a 676 X 105ms D 158 X105ms 4 A parallelplate capacitor is disconnected from a battery7 and the plates are pulled a small distance further apart Which quantities increase7 which decrease7 and which stay the same D C7 Q decrease7 AV increases7 energy stays the same D C decreases7 Q stays the same7 AV and energy increase D AV7 Q decrease7 energy stays the same7 C increases D energy decreases7 C7 Q stay the same7 AV increases 5 Two resistors7 A and B7 are separately connected across identical batteries The resistance of A is twice that of B Which resistor dissipates more power D resistor A D resistor B D both resistors dissipate the same power D more information is needed Name 6 Referring to the circuit below7 which of the following must be true In both circuits7 we attempt to measure a resistor R by separately measuring the current and voltage and using Ohm s law Assume both meters have internal resistance D Circuit a overestimates R circuit b underestimates it D Circuit a underestimates R circuit b overestimates it D Both circuits overestimate R D Both circuits underestimate R a R b R 33993 7 If the current carried by a conductor is doubled7 what happens to the electron drift velocity D it is halved D it remains the same D it is doubled D it quadruples D it decreases by four times 8 A battery having an ideal voltage of lliOOV delivers 117mA when connected to a 6709 load What is the internal resistance of the battery D 99 D 839 D 279 D 549 9 A sphere the size of a basketball is charged to a potential of 71000Vi About how many extra electrons are on it7 per cm2 of surface A basketball has a radius of N 12 cm D3gtlt107 D1X108 D5gtlt104 D7gtlt105 10 The basic rules we have used for analyzing circuits are 1 the sum of voltage sources and drops around a closed circuit loop is zero7 and 2 the amount of current entering a junction has to equal the amount of current leaving the junction These rules result from two basic physical laws What are they D Conservation of Energy and Charge Quantization D Conservation of Energy and Conservation of Momentum D Conservation of Charge and Conservation of Energy D Coulomb s law and Conservation of Charge Name 11 Refer to the gures at right What happens to the reading on AV AV the ammeter when the switch 5 is opened Assume the wires and RI E RI g switch are perfect and have zero resistancel 0 0 50 The reading goes up 5 S The reading goes down D D D The reading does not change quotM quot WV B More information is needed R2 R2 switch closed switch open 12 Rank the currents at points 1 2 3 4 5 and 6 from highest to lowest The two resistors are identical l T if ii U1 H 03 13 A parallel plate capacitor is shrunk by a factor of two in every dimension 7 the separation between the plates as well as the plates7 length and width are all two times smaller If the original capacitance is C0 what is the capacitance after all dimensions are shrunk D 2C0 D CO D 4C0 D ice 14 It takes 3X106 J of energy to fully recharge a 9V battery How many electrons must be moved across the 9V potential difference to fully recharge the battery D 1 X1025 electrons D 2 gtlt1024 electrons D 4 gtlt1012 electrons D 8 gtlt1013 electrons 15 In the circuit at right if R0 is given what value must the R1 have for the equivalent resistance between the two terminals a and b to be R0 a Rl D 2R0 R0 D R02 D 2 R0 b D Roxg Name 16 A spaceship moves away from earth at high speed How do experimenters on earth measure a clock in the spaceship to be running How do those in the spaceship measure a clock on earth to be running D slow fast D slow slow D fast slow D fast fast 17 The period of a pendulum is measured to be 300 in its own reference frame What is the period as measured by an observer moving at a speed of 09500 with respect to the pendulum D 6 00sec D 13i4sec D 0938 sec D 961 sec 18 Suppose a cylindrical electrical wire is replaced with one of the same material but having every linear dimension doubled the length and radius are twice their original valuesi Does the new wire have D the same resistance D twice the resistance D half the resistance D four times the resistance B one quarter the resistance 19 In a region of uniform electric eld E a charged particle experiences an acceleration 5f If a second particle with twice the charge and twice the mass of the rst particle enters that same region it will experience an acceleration D N Sm mh A NH SW SW D g SW SW 20 Two particles are separated by a distance of 30m each exerts an electric force of LON on the other If one particle carries 10 times as much electric charge as the other what is the magnitude of the smaller charge D lOpC D lOMC D lOnC D lOkC Name m2C 2 Constants Ice 7 393755 X 109 N e0 7 335 X 101202N m2 7 47m 8 7 150213 X 10 19 C c 7 299792 X 108 ms 77157 910933 X 10 31 kg mp 7 157252 X 10 kg m o 7 157493 X 10 kg 712 1l2 7 4 0 7 ax2bx2cgtx 2a 15m 7 ma Newton s Second Law 2 Rem 7 7 m r Centripetal 7 Current A I 7 A7 7 nqud I J 7 7 7 7 E A 7Lqu L7 787 vd 7 E 7 7 scattering time m AV l R 7 7 7 97 I A AV 2 a 7 EAt7IAV712R7 power Electric Potential APE AV 7 VB 7 VA 7 7 1 APE 7 qAV 7 7q EHA cosQ 7 7qEAc Vpcint charge 7 PEpair of point charges 7 PEsystern 7W 7 Electric Force amp Field T constant E eld 53 7 k 4142 7 12 kg 7 sum over unique pairs 7 Z A n pans I 7 APE 7 qVp 7 VA anslde 60 7W 7 7q EHA 2059 7 7qEAc keqiqz F712 quz frIZ 7 12 4 E 7 leg lt1gtE 7 lElAcoseEA7 APE 7 T constant E eld Power Pre x Abbreviation 10 12 pico p 10 9 nano n 10 6 micro u 103 milli m 10 2 centi c 103 kilo k 106 mega M 109 giga G 1012 tera T Capacitors Qeapaeitp 7 CAV 0 50A parallel plate 7 d 1 Q2 Eea amp 7 7 AV 7 P 2Q 20 Geo par 01 02 c c Geo 7 01 02 ertb dielectric NCWitbcut Resistors Req 7 121 7 122 series 1 1 1 ll 1 Req 7 R1 para e RIRZ eq 7 7 series R1 R2 Vectors F 7 1Fz2 7 F3 magnitude 9 7 tan 1 E direction Fe Units 1ev 7 15 X 10 19J 1J 1Nm1kgm252 IN 7 1kg ms2 1w 7 1J571kgm2sg 1F 7 1Cv 1C 7 1As lNC 7 1Vm Relativity 1 7 g Mame Wampum 7 map Ls a lonax L 7 7W 7 we 7 m w 7 Ac At L7t At7L 1 2 Y 02 7 YWW v v bj vobj 7 v vcbj T vobj W 1 77 1 T KE 1 7 1ch Erest mc2 E2 p202 m204 Derived unit Symbol equivalent to newton N kgms2 joule J kgm252 7 Nm watt w Js7m2kgs3 coulomb C As v WA7m2kgs3A farad F cv7 AZs lmZkg ohm Q VA7m2kgs3A2 tesla T Wbm2 7 kgsZA
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