can you please give me the solution for 1.22, thanks degrees on a tem- the giav is gChapter 15IC Principles, Concepts and Definitionreading on this scale is a certain number ofdegrees on a corresponding absolute tem-perature Scale. What is this absolute tem-26Sity is 62 1 lb/it'. (c) Answer (a) and (b)(c) Answer (a) and (b) jíProblemsOpenperature at 0°N?Ans. (a) IN =91e + 100, (b) 2360°N abs,A 67approx.1.19 A weatherman carried an aneroidbarometer from the ground floor to hisoffice atop the Sears Tower in Chicaga.desired taal) versusequatoriavariationa given rweight vaheight of1.30barometer25"read 30.150 in. Hg abs; topside it read28.607 in. Hg abs. Assume that the averageatmcspheric air density was 0.075 lb/ft' andestimate the height of the building.Onthe ground level, thereadingsand K i:Problam 1.22Ans. 1451 ft (approx.).that willAns. (a) 26.90, 26.90, (b) 25.46, 26.90, (c)illustrated,mercury1.20 Asmanometer is attached to the side of a nearly 26.10 psia.full water tank. The reading of the mercurycolumn is 15.5 in. Hg gage. Although air onthe water maintains the pressure, the other10-in. leg of the manometer is full of water;for H¿O, p = for Hg, p846 lb/ft. If the location is at standardgravity and the temperature of both the the temperature of the fluid expressed as °Rwater and mercury is 60°F, what is the pres-sure (psia) in the tank at the level where themanometer is attached? If the tank extends10 ft below this level, what is the pressure atthis depth?1.23 Convert (a) 122°F to °C and to K.(b) -40°C to °F and to °R, (c) 942°R to °C.1.31weightand to K, (d) 373 K to °F and to °R.1.24 A Fahrenheit and a Celsius ther-mometer are both immersed in a fluid andindicate identical numerical readings. What isback? 162.3 lb/ft’;in dyne1.32depencStatesapunoand as K?1.25 The same as problem 1.24 exceptthat the Fahrenheit reading is numericallytwice that of the Celsius reading.that isAns. 21.94, 26.27 psia.Ans. 780°R, 433 K.1.26 Steam at a pressure of 150 psia anda temperature of 400°F occupies a volume of3.223 ft/lb. (a) What is its density in lb/ftand in slugs/ft? (b) Convert the pressure toin. Hg and ft water (60°F). (c) Convert thetemperature to °R, K, and °C. Is temperaturean intensive or an extensive property?Ans. (a) 0.31 lb/ft', 0.00965 slugs/ft'; (b)306 in. Hg. 346 ft w.; (c) 860°R, 478 K.15.510 in. HgProblem 1.20204.4°C.1.21 A 51-ft' tank contains 3 lb of a gasat 80°F and a vacuum pressure of 24 in. Hg.(a) What is the absolute pressure in psia andpsfa? (b) What is the gas' specific volumeand density? (c) What is its temperature in°C, °R, and °K?Ans. (a) 418 psfa, (b) 0.0588 lb/ft', (c)299.7 K.1.27 A fluid moves in a steady flowmanner between two sections in a flow line.At section 1: A, = 1 sq ft, vi = 1000 fpm,v, = 4 ft'/lb. At section 2: Az = 2 ft', p2 =0.20 lb/ft. Calculate (a) the flow (Ib/hr) and(b) the velocity (fps) at section 2.%3D%3D%3D1.22 A simple mercury manometer con-nected into a flow line gives readings asshown in the figure. L.ocal gravity is standardand the mercury density is 0.488 lb/in.' Findthe pressure at points X and Y when theflow line and left leg contain (a) air whosedensity is 0.072 lb/ft', (b) water whose den-Ans. (a) 15,000 lb/hr, (b) 10.42 fps.1.28 A 10-ft diameter by 15-ft heightvertical tank is receiving. water p62.1 lb/ft') at the rate of 300 gpm and isdischarging through a 6-in. ID line with aconstant velocity of 5 fps. At a given instant.the tank is half full. Find the water level andthe mass change in the tank 15 min later.Ans. 3.90 ft. 17,550!5=

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1.22 A simple mercury manometer con- nected into a flow line gives readings as shown in the figure. Local gravity is standard and the mercury density is 0.488 lb/in.' Find the pressure at points X andY when the flow line and left leg contain (a) air whose density is 0.072 lb/ft'. (b) water whose den-

1.22 A simple mercury manometer con- nected into a flow line gives readings as shown in the figure. Local gravity is standard and the mercury density is 0.488 lb/in.' Find the pressure at points X andY when the flow line and left leg contain (a) air whose density is 0.072 lb/ft'. (b) water whose den-

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 1.7CYU: Check Your Understanding Figure 1.4 says the mass of the atmosphere is 1019kg . Assuming the density...

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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.)
Estimates and Fermi Calculations Assuming the human body is made primarily of water, estimate the volume of a person.
The density of nuclear matter is about 1018kg/m3 . Given that 1 mL is equal in volume to cm3 , what is the density of nuclear matter in megagrams per microliter (that is, Mg/L )?
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A good-quality measuring tape can be off by 0.50cm over a distance of 20m . What is its percent uncertainty?
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?
Mount Everest, at 29,028ft , is the tallest mountain on Earth. What is its height in kilometers? (Assume that 1m=3.281ft .)
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Q5. Suppose that in vereniere rzulere measurament, Length is 4-32 cm, omd the stamdared is o. 085 cm. the meon deviation othere hand, On the in Screew gauge measurce ment, the mean readius is o.621 cm and the standared the deviation is o. 000 725 Calculate cm . volume (using przo pogation of erercore in reulere and ercrcoe reelation) fore Verrniere Scrrew gauge measurements .
Calculating the Number of Molecules in a Cubic Meter of GasHow many molecules are in a typical object, such as gas in a tire or water in a glass? This calculation can give us an idea of how large N typically is. Let’s calculate the number of molecules in the air that a typical healthyyoung adult inhales in one breath, with a volume of 500 mL, at standard temperature and pressure (STP), which is defined as 0 ºC and atmospheric pressure. (Our young adult is apparently outside in winter.)StrategyBecause pressure, volume, and temperature are all specified, we can use the ideal gas law, pV = NkB T, to find N
This was wrong. Can you solve this again with these numbers? What is the root mean square velocity, vrms, for Hydrogen molecules (H2) at 20oC? Hint: How many amu does an H2 molecule contain. 1 amu = 1.67 x 10-27 kg Boltzman's Constant, k = 1.38 x 10-23 J/K Give your answer in m/s to 4 significant figures (NO DECIMALS)
(a) What is the coefficient of variation (CV)? Why do you study such variations? Explain using a real-life example.(b) Among the different measures of dispersion which one do you think is better and why?The following table gives the distribution of gas bills (GB’s) of some households (hhs) in a city- GB’s ($.’0) No. of hhs 375-450 41 450-525 95 525-600 31 600-675 61 675-750 19 (i) Calculate the ideal measures of dispersion.(ii) Make comments from your findings.