A fan has a bladed rotor of 30 cm outside diameter and 12 cm inside diameter and turns at rate ω = 180 rad/s. The width of each rotor blade is 2.7 cm and the volume flow rate is Q = 0.1 m3 /s. The absolute velocity of the air (rho = 1.23 kg/m3 ) at blade inlet, V1, is purely radial. What would be a reasonable blade inlet angle (measured with respect to the tangential direction at the inside diameter of the rotor)?

What would the difference of spectral lines emitted by hydrogen gas in distant galaxies which is normally found at a wavelength of 21 cm on earth, be observed at 21.1 centimeters?

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.

The a992 steel rod bc has a diameter of 50 mm and is used as a strut to support the beam. determine the maximum intensity w of the uniform distributed load that can be applied to the beam without risk of causing the strut to buckle. take f. s. = 2 against bucklin