Physics Laboratory Experiments
8th Edition
ISBN: 9781285738567
Author: Jerry D. Wilson, Cecilia A. Hernández-Hall
Publisher: Cengage Learning
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Chapter 2, Problem 5ASA
In expressing experimental error or uncertainty, when should (a) experimental error and (b) percent difference be used?
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In expressing experimental error or uncertainty, when should (a) experimental error and (b) percent difference be used?
In a Measurement ,the Expected value is 72 V and the measured value is 63 V. Find
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(iii) Absolute accuracy Aa
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i) Absolute Error=
(ii)Relative error=
(iii) Absolute accuracy=
(iv) Relative Accuracy =
Measured values are usually presented as mean plus or minus uncertainty. If two experimental valuesare (8.1 ± 0.5) and (7.9 ± 0.4), what is the uncertainty of their difference?
Chapter 2 Solutions
Physics Laboratory Experiments
Ch. 2 - Do experimental measurements give the true value...Ch. 2 - Distinguish between random (statistical) error and...Ch. 2 - What is the difference between measurement...Ch. 2 - What determines how many figures are significant...Ch. 2 - In expressing experimental error or uncertainty,...Ch. 2 - How could the function y = 3t2 + 4 be plotted on a...Ch. 2 - Read the measurements on the rulers in Fig. 2.9,...Ch. 2 - Were the measurements of the block in part (b) of...Ch. 2 - Referring to the dart analogy in Fig. 2.3, draw a...Ch. 2 - Prob. 4Q
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- In a Measurement ,the Expected value is 64 V and the measured value is 62 V. Find (i) Absolute error Ea , (ii) Relative error Er, (iii) Absolute accuracy Aa (iv) Relative Accuracy Ar. [* i) Absolute Error= (ii)Relative error= (iii) Absolute accuracy=arrow_forwardThe measurement error is defined as AX=X-Xo.where Xo is the true value of a physical quantity. X is the measured value of the physical quantity, AX is also known as "absolute error" What is the correct understanding to absolute error? Select one: O a An absolute error indicates the absolute value of the error. Ob Absolute error is the difference between the measured value and the true value. O e Absolute error indicates that the error is always positive. Od. Absolute eror indicates that the magnitude of an error is certain.arrow_forwardA series of four measurements of the ratio of the circumference to diameter of a disk are made. The results of these measurements are: 3.140, 3.133, 3.132, 3.133. The average of the four measurements is the experimental value for Pi-Lab and the accepted value is Pi = 3.141. What is the percent error of these measurements? a) 1 % b) 2% c) 0.5% d)0.2%arrow_forward
- A function Fis given by / - 4 where y = (8.854 0.05) and x = (5.11 ÷ 0.03) What is the absolute uncertainty in F% Specifi vour answer up to three decimal placesarrow_forward(a) What is the relationship between the precision and the uncertainty of a measurement? (b) What is the relationship between the accuracy and the discrepancy of a measurement?arrow_forwardIn an experiment to understand the concepts of potential and kinetic energies, as shown below, suppose, you are making some errors while making the measurement. Initial Height H. Final neight H, If the weight used in the experiment is having an uncertainty of 1.1 0.02 N, the initial height is measured, with an uncertainty of 55 0.07 cm and the final height with an uncertainty of 23.5 t 0.07 cm. (Potential energies are calculated by the formula weight x height) Calculate,arrow_forward
- Find the uncertainty in a calculated electrical potential difference from the measurements of current and resistance. Electric potential difference depends on current and resistance according to this function V(I,R) = IR. Your measured current and resistance have the following values and uncertainties I = 8.1 Amps, SI = 0.8 Amps and R = 39.7 Ohms and SR = 0.4 Ohms. What is the uncertainty in the SV?|arrow_forward(a) A person's blood pressure is measured to be 104 ± 2 mm Hg. What is its percent uncertainty? (Note that percent uncertainties should be reported to two significant figures.) % (b) Assuming the same percent uncertainty, what is the uncertainty in a blood pressure measurement of 80 mm Hg? (Note that uncertainties should be reported to one significant figure.). mm Hgarrow_forwardDiscuss the propagation of errors and state the uncertainty in calculated terms. A cylinder has a mass of 50 g + 2, radius 2 cm + 0.02 and height of 10 cm + 0.1 cm Find the nominal value of the cylinders density and the uncertainty in the density. Density = mass/volume Vol = Ttr?harrow_forward
- A marathon runner completes a 42.188-km course in 2 h, 39 min, and 25 s. There is an uncertainty of 24 m in the distance traveled and an uncertainty of 1 s in the elapsed time. (Give all answers to the appropriate number of significant figures. Note that uncertainties should be reported to one significant figure and percent uncertainties should be reported to two significant figures.) (b) Calculate the percent uncertainty in the elapsed time. (c) What is the average speed in meters per second? (d) What is the uncertainty in the average speed?arrow_forwardA person measures his or her heart rate by counting the number of beats in 30s. If 40+1 beats are counted in 30.0 + 0.5s , what is the heart rate and its uncertainty in beats per minute?arrow_forwardWhat is the volume and its approximate uncertainty of a sphere of radius 1.96 +- 0.0m?arrow_forward
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