Assignment 4

Assignment 4 - Physics 257: Assignment 4 ANSWER KEY Due...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Prof. Matt Dobbs Page 1/6 Physics 257 Asst 4 Physics 257: Assignment 4 ANSWER KEY Due in-class before 1:05pm Thursday October 18, 2006 Remember to use the correct number of significant figures for your answers. Answers with incorrect significant figures will get zero marks. For plots, remember to label your axes correctly and use the “graphs” checklist on page 7 of the lab book. Graphs must be computer generated from now on. For each question, show all your steps. Assignments handed in after 1:05pm but before the end of the day will lose 25% of the grade. 1. The following data has been collected from an experiment: x = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 ] y = [ 7.43, 13.17, 12.23, 23.54, 19.59, 23.34, 29.20, 29.17, 31.71, 32.50, 38.88, 36.99, 46.14, 51.87, 47.92 ] x is the independent variable and y is the dependent variable. Both x and y are dimensionless. The error for x is negligible. There measurement error for one measurement of y is Δ y = σ y = 4. [NOTE: so far this is the same data and question as Asst3.] You are reviewing their experiment and trying to decide if they chose a reasonable value for the error on y. In Asst2 you should have found: slope = 2.9±0.2 and y-intercept = 6±2. Use these numbers for this question even if you got the wrong answer for Asst2. a) How many degrees of freedom (DOF) N are there in the data points? How many DOF M are there in the fit parameters? How many DOF are there in this straight line fit ( N-M )? ( 1 mark ) DOF of data points: 15, as there are 15 data points. DOF of fit parameters: 2, namely "a" and "b". DOF of straight line fit: (15 data point – 2 fit parameters) = 13. b)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/29/2008 for the course PHYS 230 taught by Professor Harris during the Fall '07 term at McGill.

Page1 / 6

Assignment 4 - Physics 257: Assignment 4 ANSWER KEY Due...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online