A laboratory wind tunnel has a test section 25 cm square and 50 cm long. With nominal air speed U1 =25m=s at the test section inlet, turbulent boundary layers form on the top, bottom, and side walls of the tunnel. The boundary-layer thickness is δ1 =10 mm at the inlet and δ2 =30 mm at the outlet from the test section. The boundary-layer velocity profiles are of power-law form, with u=U =ðy=δÞ1=7. Evaluate the freestream velocity, U2, at the exit from the wind-tunnel test section. Determine the change in static pressure along the test section.

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Asingle-geared blanking press has a stroke of 200 mm and a rated capacity of 320 kn. a cam driven ram is assumed to be capable of delivering the full press load at constant force during the last 15 percent of a constant-velocity stroke. the camshaft has an average speed of 90 rev/min and is geared to the flywheel shaft at a 6: 1 ratio. the total work done is to include an allowance of 16 percent for friction a) estimate the maximum energy fluctuation b) find the rim weight for an effective diameter of 1.2 m and a coefficient of speed fluctuation of 0.10

Burgers vector is generally parallel to the dislocation line. a)-true b)-false