Electricity Designing a Voltmeter c 2 testing Review. Lecture # 7 Physics 2BL Summer 2011
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1 Electricity Designing a Voltmeter c 2 testing Review Lecture # 7 Physics 2BL Summer 2011
2 Announcements CAPE evaluations: Important for fine tuning of the course Making changes Giving feedback Name for clicker score ID # 1F850399
3 The Four Experiments Determine the average density of the earth Measure simple things like lengths and times Learn to estimate and propagate errors Non-Destructive measurements of densities, structure Measure moments of inertia Use repeated measurements to reduce random errors Test model for damping; Construct and tune a shock absorber Damping model based on simple assumption Adjust performance of a mechanical system Measure coulomb force and calibrate a voltmeter. Examine electrical forces, parallel plate capacitor, torsional pendulum. Balancing forces. Reduce systematic errors in a precise measurement.
4 Purpose Design a means to measure electrical voltage through force exerted on charged object Method Use Torsional pendulum Balance forces, balance torques
5 Basic Equations
6 Experiment #4: Parallel Plate Capacitor
7 Calibrate Voltmeter
8 Voltmeter Appartus
9 Measure k using Torsional Pendulum e k = (e I ) 2 + (2e T ) 2 s k = k * (e k )
10 Moment of Inertia rod parallel axis theorem disks - CM s I = [(di/dm)s m ] 2 + [(di/dm 1 )s m1 ] 2 + [(di/dm 2 )s m2 ] 2 + [(di/dl)s l ] 2 + [(di/dr)s r ] 2
11 Error in Moment of Inertia I = 1/3(ml 2 ) +(m 1 +m 2 ) l 2 + (m 1 +m 2 )R 2 /4 s I = [(di/dm)s m ] 2 + [(di/dm 1 )s m1 ] 2 + [(di/dm 2 )s m2 ] 2 + [(di/dl)s l ] 2 + [(di/dr)s r ] 2 di/dm = 1/3(l 2 ) di/dm 1 = l 2 + R 2 /4 = di/dm 2 di/dl = 2/3(ml) + 2(m 1 +m 2 )l di/dr = 1/2(m 1 +m 2 )R
12 Capacitor Electrical Force
13 Torsion
14 Equilibrium Positions
15 Clicker Question # 11 Do you expect a plot of V versus q to be linear? V = d 2kq/lAe 0 (A)Yes (B)No
16 Error Propagation V = d 2kq/lAe 0 e V = (e d ) 2 + (e k /2) 2 + (e q /2) 2 + (e A /2) 2 + (e l /2) 2 s V = V * (e V )
17
18 c 2 Testing (Taylor Chapter 12)
19 Degrees of Freedom d
20 Fitting Summary
21 Example - Dice
22 Application of c 2 Use of Table D ~
23 c 2 Test for a Fit If Prob(c ~ 2 > ~ c 2 ) is less than 5% - disagreement significant If Prob(c ~ 2 > ~ c 2 ) is less than 1% - disagreement highly significant
24 Review Determination of errors from measurements Two types random (statistical) and systematic Random errors intrinsic uncertainty (limitations) Can be determined from multiple measurements Mean and standard deviation, standard deviation of the mean Propagation or uncertainties through formulas Simple formula for adding two terms (a=b+c) Simple formula for multiplying two terms (a=b*c) General formula for g(x,y,z)
25 Overview Will be given basic physics equations Need to know how to use them (labs) Understand significant figures and how to quotes values properly Need to know basic error propagation formulas Need to know Gaussian distributions mean, standard deviation, standard deviation of the mean
26 Overview Know how to determine t-values extract probability information from those values Understand rejection of data Chauvenet s principle Know how to calculate weighted averages Let s do an example
27 Example Exam Question You want to determine the torsional constant for the wire you used in the last experiment. You do this by measuring the period of oscillation. You make 5 measurements of 15.1 s, 13.2s, 14.4 s, 15.4 s and 14.6 s. What is the best value for the torsional constant k with the proper number of significant figures and uncertainty. You also determined the moment of inertia to be (2420 ± 120) g cm 2.
28 Example Solution (1) Draw diagram (2) Identify given parameters Given T values and I (3) Write the equation(s) necessary to calculate k (4) Calculate best value for T T best = T ave = s
29 Example Solution (5) Calculate uncertainty in T s T = s s T = s = 0.4 s T best = (14.5 ± 0.4) s (6) Calculate k from best values k = 4p 2 I/T 2 = units g cm 2 /s 2
30 Example Solution (7) Calculate uncertainty for k e k = (e ) 2 I + (2e T ) 2 e k = (120/2420) 2 + (2*0.4/14.5) 2 e k = (.0496) 2 + (.0552) 2 Most significant source of uncertainty? e k =.07 s k = k * (e k ) = 30 g cm 2 /s 2 Thus, k = (450 ± 30) g cm 2 /s 2
31 Schedule Meeting Experiment 1 (Jun 28) None (start Taylor) 2 (Jun 30) 1 3 (July 5) 1 4 (July 7) 2 5 (July 12) 2 6 (July 14) 3 7 (July 19) 3 8 (July 21) 4 9 (July 26) 4 10 (July 28) Extended Quiz
32 Reminder Prepare for Experiment 4 Last lecture - No more lectures Class time will become office hours Remember to prepare for extended quiz which will be designed for ~50 minutes and have a higher weighting then a single lab quiz
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FENG CHIA UNIVERSITY Fundamentals of Physics I (With Lab) PHYS114, Summer 2018 (May14-Jun15) Lecturer: TBA E-mail: TBA Time: Monday through Friday Contact hours: 60 (50 minutes each) Credits: 4 Office
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