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?

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented