Consider an isotropic aluminum alloy with Young's modulus E = 68.9 GPa, Poisson's ratio v = 0.33, and shear modulus G = 25.9 GPa. Find the strains Ex, Ey, and Yxy for the following stress loads: a) Ox = 100 MPa, y = 0 MPa, Txy = 0 MPa b) Ox = 0 MPa, y = 0 MPa, Txy = 20 MPa c) Ox = 100 MPa, y = –100 MPa, Txy = 0 MPa d) Ox = 100 MPa, y = 100 MPa, Ixy = 20 MPa

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

Vibration monitoring this technique uses the noise or vibration created by mechanical equipment and in seme cases by plant systems to detemine their actual condtion. a)- true b)- false

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?