College Physics I- PHYSI 120 Date rairie State College Experiment A1: Measuremen
ID: 1661256 • Letter: C
Question
College Physics I- PHYSI 120 Date rairie State College Experiment A1: Measurements and Uncertainties in Measurements tach the original DATA SHEET to your lab report NAME: re-lab questions: Please answer each question. Use separate sheets 1. What is the difference between accuracy and precision? Explain 2. Calculate the volume and percent error/uncertainty in the volume of a rectangular sample block of length 13.51 ±0.05 cm, width 6.23 ±0.02 cm, and thickness of 1.76 ± 0.02 cm. 3. Calculate the mass density and uncertainty in the mass density of the sample block Mass of the block is 289± 1 gr Parts A, C, and D: Vernier Caliper Smallest Division = Cylindrical Length Diameter, Mass, V cm. Estimated uncertainty=± cm. CalculateStandard% Value Erro | , L (cm) | | M (g) | (cm) | Sample D (cm) d (g/cm3) (g/cm3) TinExplanation / Answer
1.
Accuracy : it is the closeness of measured value to the true value.
It is a measure of how close the measured value of any variable is to its true value.
Precision : it is closeness of all the measured values in different trials irrespective of the true value. A set of measurements can be inaccurate but if there is consistency between their values, the process of measurement is said to be precise.
Q2.
Volume is given by V=l*b*h
=13.51*6.23*1.76
=148.134 cm^3
Taking derivative on each side,
dv/v=(dl/l)+(dh/h)+(db/b)
=(0.05/13.51)+(0.02/6.23)+(0.02/1.76)=0.018275
Then percentage error =1.8275%
Q3.mass density =mass / volume = 1.95 gram/cm^3