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- The escape velocity of any object from Earth is 11.2km/s. (a) Express this speed in m/s and km/h. (b) At what temperature would oxygen molecules (molecular mass is equal to 32.0g/mol ) have an average velocity vrms equal to Earth's escape velocity of 11.1km/s ?4. Compute the linear attenuation coefficient of iron oxide (Fe304) at 1 MeV. Use the figures provided and the following information; µc = (Opp x Z?), PPi = g/mole, AFe NeocZ, µpe = Nope (Ope X 2"), Mрp — Nopр 11.3 g/cm³, pre304 = 5.8 g/cm³, Zp = 82, ZFe = 26, Zo = 8, Ap6 = 207.19 = 55.85 g/mole, Ao = 16 g/mole. (Note: µFe304 = µFe+ µ0).10:55 > t.myexams.unisa.ac.za MENU E Frag question A. 5.0 x 108 ft³ B. 6.0 x 108 ft³ C. 8.6 x 108 ft³ D. 2.1 x 108 ft³ E. 4.8 x 108 ft³ ||| Vol) 4G LTE2 T The largest building in the world by volume is the Boeing 747 plant in Everett, Washington. It measures approximately 650 m long, 710 yards wide, and 110 ft high. What is its volume in cubic feet? O 47 71% < myExams
- Match the word and definition 1. any physical quantity that does not have a direction associated with it 2. time it takes for one complete cycle of a periodic process 3. the rate of change of velocity 4. the slope of a distance versus time graph equals this 5. any physical quantity that has a direction associated with it 6. most widely used system of measure 7. the number of cycles of a periodic process that occur per unit time 8. metric prefix that means one thousand A. acceleration B. English C. Frequency D. kilo- E. metric F. milli- G. period H. scalar I. velocity J. vector22) There are three separate containers. One contains a monatomic gas, another one a diatomic gas with vibrational modes frozen, and the third a solid. There is one mole of each substance. If you add the same amount of heat to each container, rank from least to most the change of temperature of each substance. A: solid, monatomic gas, diatomic gas B: monatomic gas, diatomic gas, solid C: solid, diatomic gas, monatomic gas D: diatomic gas, monatomic gas, solid E: monatomic gas, solid, diatomic gasWhen water freezes to make a snowflake crystal, the entropy of the waterA. Decreases.B. Increases.C. Does not change.
- 11) When a perfect gas undergoes a reversible isobaric process, the change in entropy is Tf VE b. nCy ln с. nСp In Ti d. nRln; a. zero 12) According to Fourier's law of conduction, the rate of heat transfer through a solid wall is inversely proportional to its a. thickness b. volume с. area d. typeA process at constant volume pressure takes n mole vibrating diatomic from an initial temperature T to a final temperature 3T. Calculate the change in enthalpy, AH. Select one: O a. O b. ΔΗ AH = 9nRT AU = 5n RT O c. AH 11nRT ΔΗ O d. AH = 7nRT -The internal energy of an ideal gas depends on A) its pressure. B) its temperature. C) its temperature, pressure, and volume. D) its temperature and pressure. E) its volume.
- 15. The pressure of a monatomic ideal gas is doubled, while its volume is reduced by a factor of four. What Ms the ratio of the new rms speed of the atoms to the initial rms speed?30. Which, of the following, is not a characteristic of an irreversible process in a closed system, such as the aging of the universe? A. The randomness of the system will increase. B. The entropy of the system will increase. C. The probability of greater order is greater than the probability of lesser order. D. The nature of the system is to become less ordered.Average atomic and molecular speeds (vrms) are large, even at low temperatures. What is vrms for helium atoms at 5.00 K, just one degree above helium's liquefaction temperature?