hi, please help me answer question 1,2, and 3. i will post the other problems in another question. thank you so much 1.is there a difference in the accuracy of measurements of the reading if the units usedAnswer the following questions. Write you explanation on a separate sheet of paper.What I Have LearnedCheck your understanding!vary? Why?2 Up to what precise measure could each instrument be read?a Which of these three measuring devices:ruler, verner caliper and micrometer is themost versatile? Justify your answer.A The smallest unit on a ruler is 1mm. Two students measured the width of a woodenslock and recorded them as 5.25 cm and 5.27 cm.Analyze the data gathered. Arethese two equally precise? Comment5 Can measurements be accurate but not precise? Justify your answer by citing aspecific example.6 Two students, John and Jay are given a small cylinder of aluminium of known mass andasked to determine its density. (The 'accepted' density of aluminium is 2.702 g/cm)Since density is mass/volume, the students need to calculate the volume of the cylinder.The height and diameter of the cylinder need to be measured in order to calculate itsvolumeJohn is told to use a simple plastic ruler and to make four independent measurementsfor each dimension. Jay is told to use a precision measuring tool called a micrometer.John-plastic ruler2.2 g/cm32.3 g/cm2.7 g/cm32.4 g/cmJay - micrometer2.703 g/cm2.701 g/cm?2.705 g/cm5.811 g/cm3a.Which student's data is more accurate? Cite factor(s) that might affect themeasurement's accuracy.b. Which student's data is more precise? Cite factor(s) that might affect themeasurement's precision.15

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Answer the following questions. Write you explanation on a separate sheet of paper. 1.is there a difference in the accuracy of measurements of the reading if the units used Check your understanding! vary? Why? 2 Up to what precise measure could each instrument be read? Hbich of these three measuring devices:ruler, verner caliper and micrometer is the most versatile? Justify your answer. A The smallest unit on a ruler is 1mm. Two students measured the width of a wooden block and recorded them as 5.25 cm and 5.27 cm.Analyze the data gathered. Are these two equally precise? Comment. 5 Can measurements be accurate but not precise? Justify your answer by citing a specific example. John and Jay are given a small cylinder of aluminium of known mass and

Answer the following questions. Write you explanation on a separate sheet of paper. 1.is there a difference in the accuracy of measurements of the reading if the units used Check your understanding! vary? Why? 2 Up to what precise measure could each instrument be read? Hbich of these three measuring devices:ruler, verner caliper and micrometer is the most versatile? Justify your answer. A The smallest unit on a ruler is 1mm. Two students measured the width of a wooden block and recorded them as 5.25 cm and 5.27 cm.Analyze the data gathered. Are these two equally precise? Comment. 5 Can measurements be accurate but not precise? Justify your answer by citing a specific example. John and Jay are given a small cylinder of aluminium of known mass and

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter1: Units And Measurement

Section: Chapter Questions

Problem 88CP: The first atomic bomb was detonated on July 16, 1945, at the Trinity test site about 200 mi south of...

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A marathon runner completes a 42.188-km course in 2 h, 30 min, and 12s. There is an uncertainty of 25 m in the distance traveled and an uncertainty of 1 s in the elapsed time. (a) Calculate the percent uncertainty in the distance. (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?
(a) If your speedometer has an uncertainty of 2.0 km/h at a speed of 90 km/h, what is the percent uncertainty? (b) If it has the same percent uncertainty when it reads 60 km/h, what is the range of speeds you could be going?
(a) How many significant figures are in the numbers 99 and 100.? (b) If the uncertainty in each number is 1, what is the percent uncertainty in each? (c) Which is a more meaningful way to express the accuracy of these two numbers: significant figures or percent uncertainties?
The first atomic bomb was detonated on July 16, 1945, at the Trinity test site about 200 mi south of Los Alamos. In 1947, the U.S. government declassified a film reel of the explosion. From this film reel, British physicist G.I. Taylor was able to determine the rate at which the radius of the fireball from the blast grew. Using dimensional analysis, he was then able to deduce the amount of energy released in the explosion, which was a closely guarded secret at the time. Because of this, Taylor did not publish his results until 1950. This problem challenges you to recreate this famous calculation. (a) Using keen physical insight developed from years of experience, Taylor decided the radius rof the fireball should depend only on time since the explosion, t, the density of the air, , and the energy of the initial explosion, E. Thus, he made the educated guess that r=kEabtcfor some dimensionless constant kand some unknown exponents a,b, and c. Given that [E]=ML2T-2 , determine the values of the exponents necessary to make this equation dimensionally consistent. (Hint: Notice the equation implies that k=rEabtcand that [k]=1 ). (b) By analyzing data from high-energy conventional explosives, Taylor found the formula he derived seemed to be valid as long as the constant khad the value 1.03. From the film reel, he was able to determine many values of rand the corresponding values of t. For example, he found that after 25.0 ms, the fireball had a radius of 130.0 m. Use these values, along with an average air density of 1.25kg/m3 , to calculate the initial energy release of the Trinity detonation in joules (J). (Hint: To get energy in joules, you need to make sure all the numbers you substitute in are expressed in terms of SI base units.) (c) The energy released in large explosions is often cited in units of “tons of TNT” (abbreviated “t TNT”), where 1 t TNT is about 4.2 GJ. Convert yow answer to (b) into kilotons of TNT (that is, kt TNT). Compare your answer with the quick-and-duty estimate of 10 kt TNT made by physicist Enrico Fermi shortly after witnessing the explosion from what was thought to be a safe distance. (Reportedly, Fermi made his estimate by dropping some shredded bits of paper right before the remnants of the shock wave hit him and looked to see how far they were carried by it.)
(a) If your speedometer has an uncertainty of 2.0 km/h at a speed of 90 km/h, what is the percent uncertainty? (b) If it has the same percent uncertainty when it reads 60 km/h, what Is the range of speeds you could be going?
When nonmetric units we used in the United Kingdom, a unit of mass called the pound-mass (lbm) was used, where 1 lbm = 0.4539 kg. (a) If there is an uncertainty of 0.0001 kg in the pound-mass unit, what is its percent uncertainty? (b) Based on that percent uncertainty, what mass in pound-mass has an uncertainty of 1 kg when converted to kilograms?
Basic rules in considering a formula or writing an equation in Physics would be : 1. The fundamental or base quantities such as length [L], mass [M], time [T], are called dimensions 2. Dimensional analysis is a procedure to verify the experimental correctness of an equation. 3. Both sides of an equation must match in numerical values even though dimensions are not matched 4. Dimensions may be treated like algebraic quantities. Which of the above rules are correct? . Rules 2 and 4 • Rules 1 and 3 • Rules 1 and 2 . Rules 1 and 4
1. The following data are the measurements of the dimensions of a box: l = 8.6 ± 0.5 cm h = 20.19 ± 0.01 mm w = 0.75 ± .02 mHow should the volume of the box be reported (central value ± uncertainty) incm3? Show solution.2. If the accepted value of the volume of the box in the previous question is 1300 cm3, is the measurement acceptable? Explain.
C. leas t del Niu 3. Three students make measurements (in m) of the length of a rod using a meter stick. Each student's measurements are tabulated in the table below. Using your calculator in statistic mode calculate the mean L, standard deviation S and uncertainty u of the measurements. Student L1 L3 L2 1.4711 L4 1.4715 SD u Student 1 1.4717 1.4722 1,4716 t.4754 1.4710 1.4753 1.4759 1.4756 1.4749 Student 2 Student 3 1.4719 1.4723 1.4705 1.4719 Note that the actual length of the rod is determined by a laser measurement technique to be 1.4715 m (this should be considered the standard value). a) State how one determines the accuracy of a measurement. Apply your idea to the measurements of the three students above and state which student has the most accurate measurement.
State the number of significant digits and the implied precision of the given number. The number 1.928×10^4 has........ significant digits (type a whole number) B. What is the implied precision of the number 1.928×10^4 s? A. The number is precise to the nearest hundred seconds B. The number is precise to the nearest second. C. The number is precise to the nearest ten seconds
A. Unit Conversion. Show your complete solution. Write your answers up to 3 significant figures. Recall: 1 Gy = 100 rad, 1 Sv = 100 rem 1. 3.5 μGy to mrad 2. 5.0 mrad/h to mGy/h 3. 45.0 mrem to μSv
How many correct experiments do we need to prove a theory? Explain.