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The National Transonic Facility (NTF) is a wind tunnel designed to operate at Mach and Reynolds numbers comparable to flight conditions. It uses nitrogen at cryogenic temperatures as the working fluid. A schlieren photograph taken in the NTF of a 1/20th scale model of a Concorde airplane (full-scale wingspan of 30 m) shows a Mach angle of 28° at a point where the temperature is 100°K and the pressure is 9, 000 P a. Find the local Mach number and the Reynolds number based on the model wingspan, given that the viscosity of nitrogen under these conditions is 7 × 10-6N · s/m2 . Compare with the conditions experienced by the full-scale airplane flying at 600 m/s at an altitude of 20, 000 m in a standard atmosphere.
A 0.831-g sample of SO3 is placed in a 1.00 L container and heated to 1100 K. The SO3 decomposes to SO2 and O2: 2SO3 (g) 2SO2 (g) + O2 (g). At equilibrium the total pressure in the container is 1.300 atm.
The atom then emits two photons: one of wavelength 3174 nm to reach an intermediate level, and a second to reach the ground state. What was the wavelength of the second photon emitted
Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons. Show the formal charges of all atoms in the correct structure for NH4
A sample of gas occupies 2.78 x 103 mL at 25oC and 760 mm Hg. What volume will the gas sample occupy at the same temperature and 475 mm Hg?
What is the relationship between the wavelength and the frequency of radiant energy? Ozone in the upper atmosphere absorbs energy in the 210-230-nm range of the spectrum. In what region of the electromagnetic spectrum does this radiation occur?
Explain what is the morality of NaOH if 41.67 ml solution is required to neutralize 0.2625 grams of pure H2C2O4*2H20
By Solving this problem student understand about isotopic abundance and how to calculate atomic weight (average atomic mass) of an element -
According to the following thermochemical equation, what mass of H2O (in g) must form in order to produce 975 kJ of energy?
Question- How many millilitres of 0.350M KOH should be added to 3.50g of oxalic acid to create a buffer with a pH of 4.50 when diluted to 250ml? (pk1=1.252, pk2=4.266, FW=90.036
Finding Literature Values for Atomic Line Spectra in gas discharge tubes
At what temperature would a 1.20 M NaCl solution freeze, given that the van't Hoff factor for NaCl is 1.9? K_f for water is 1.86 C/m
2 g of a mixture of carbonate , bicarbonate and chlorides of sodium on heating produced 56 ml of CO2 at NTP. 1.6 g of the same mixture required 25 mlof N HCl S solution for neutralization. Calculate % of each component present in mixture.
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