A thin steel [ E = 30 , 000 ksi ; v = 0.3 ] plate in a state of plane stress has dimensions of 9.00 in . in the x direction and 3.50 in . in the y direction. The plate increases in length in the x direction by 0.0015 in . and decreases in the y direction by 0.00028 in . Compute the normal stresses σ x and σ y that produced these deformations. Assume that τ x y = 0 .

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

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2

Carbon dioxide gas expands isotherm a turbine from 1 mpa, 500 k at 200 kpa. assuming the ideal gas model and neglecting the kinetic and potential energies, determine the change in entropy, heat transfer and work for each kilogram of co2.