The velocity profile for the flow of a Newtonian fluid between two fixed, wide, parallel plates is given by the equation u => 1-0), where V is the average velocity. The fluid has a viscosity of 1 mPa. s. Also, V=0.35 cm/s and h= 5 cm. Determine: a. the shearing stress acting on the bottom wall b. the shearing stress acting on the plane parallel to the walls and passing through the centerline (mid-plane). Sketch the profile of the magnitude of the shear stress from the centerline to the walls. c. If the density of the fluid described in this problem is 1000 kg/m", is the flow laminar or turbulent?

An electrical motor raises a 50kg load at a construct velencity .calculate the power of the motor, if it takes 40sec to raise the load through a height of 24m(take g =9.8n/g)

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Calculate the bore of a cylinder that has a stroke of 18 inches and an extension time of 6 seconds at a flow rate of 4 gal/min.