5/98 The two rotor blades of 32‐in. radius rotate counterclockwise with a constant angular velocity ω = ˙ θ = 2 rad / sec ω=θ˙=2 rad/sec about the shaft at O mounted in the sliding block. The acceleration of the block is aO = 10 ft/sec2. Determine the magnitude of the acceleration of the tip A of the blade when (a) θ = 0, (b) θ = 90°, and (c) θ = 180°. Does the velocity of O or the sense of ω enter into the calculation?

Most leaks in reciprocating air compressors can be detected and minimized by: (clo4) a)-detecting leakage areas using ultrasonic acoustic detector. b)-tightening joints and connections c)-replacing faulty equipment d)-all of the given options

Air is compressed isentropically from an initial state of 300 k and 101 kpa to a final temperature of 1000 k. determine the final pressure using the following approaches: (a) approximate analysis (using properties at the average temperature) (b) exact analysis

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.