Asolid steel disc has an outer diameter of 500mm and a constant thickness of 25mm. the disc has 110 steel blades equi-spaced around its outer edge. each blade has a cross-sectional area of 60mm2. the disc is rotating at 1200rpm and the average radial stress is 150mpa. the density of steel is 7480 kg/m3. how long are the blades to the nearest mm?

Which from the following instrument is commonly used to detect the high pitch butzing sound in bearings? [clo4] a)-digital ultrasonic meter b)-infrared camera c)-spectroscopic d)-vibrometer

How much power could a wind turbine produce if it had the following specifications? cp = 0.45 -d=1.2kg/m3 d=50m v 5m/s

Air enters a horizontal, constant-diameter heating duct operating at steady state at 290 k, 1 bar, with a volumetric flow rate of 0.25 m°/s, and exits at 325 k, 0.95 bar. the flow area is 0.04 m2. assuming the ideal gas model with k = 1.4 for the air, determine (a) the velocity at the inlet and exit, each in m/s, and (c) the rate of heat transfer, in kw flow rate, in kg/s, (b) the mass kg 0.3