Civil and Environmental Engineering Answers

A solid steel bar of diameter d1 = 25.0 mm is enclosed by a steel tube of outer diameter d3 = 37.5 mm and inner diameter d2 = 30.0 mm (see figure). Both bar and tube are held rigidly by a support at end A and joined securely to a rigid plate at end B. The composite bar, which has a length L = 550 mm, is twisted by a torque T = 400 N-m acting on the end plate.

(a) Determine the maximum shear stresses Ƭ1 and Ƭ2 in the bar and tube, respectively.

(b) Determine the angle of rotation ϕ (in degrees) of

the end plate, assuming that the shear modulus of

the steel is G = 80 GPa.

(c) Determine the torsional stiffness kT of the

composite bar.

If the kinematic viscosity of water at S.TP is 1:0038 x 10 m²/a and the mass density is 998.23 kg/m³, calculate its absolute viscosity

If the kinematic viscosity of water at S.TP is 1:0038 x 10 m²/a and the mass density is 998.23 kg/m³, calculate its absolute viscosity

find the angle the surface tension film leaves the glass for a vertical tube immersed in water if the diameter is 0.25 inch and the capillary rise is 0.08 inch. use δ=0.005 lb/ft.

two clean parallel glass plate, separated by a distance d=1.5 mm, are dipped in a bath of water. how far does the water rise due to capillary action, if δ=0.0730 N/m?

a square block weighing 1.1kn and 250 mm on an edge slides down an incline on a film of foil 6.0μm thick. assuming a linear velocity profile in the oil and neglecting air resistance, what is the terminal velocity of the block? the viscosity of oil is 7 Mpa-s angle of inclination to 20°.

(a) if 12m³ of nitrogen at 30°c and 125kpa abs is permitted to expand isothermally to 30m³, what is the resulting pressure?

(b) what would the pressure and temperature have been if the process had been isentropic?

air is kept at a pressure of 200kpa and a temperature of 30°c in a 500-l container. what is the mass of the air?

calculate the density of water vapor at 350kpa abs and 20°c if its gas constant is 0.462kpa-m³/kg-°k.

what would be the weight of 13kg mass on a planet where the acceleration due to gravity is 10m/s²?