Consider a low-speed subsonic wind tunnel with a nozzle contraction ratio of 1 : 20. one side of a mercury manometer is connected to the settling chamber and the other side to the test section. the pressure and temperature in the test section problems 281 are 1 atm and 300 k, respectively. what is the height difference between the two columns of mercury when the test section velocity is 80 m/s?

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2

What is a view of science and psychology that says the value of knowledge depends on its usefulness? a. pragmatism b. psychotherapy c. physiology

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?