Determine the size of the footing

A 20-kips axial load is applied to a short wooden post which is supported by a concrete footing resting on undisturbed soil as shown. Determine the size "b" of the concrete footing if the average bearing stress on the soil is not to exceed 30 psi. a. b = 25.8 in. b. b = 22.4 in. c. b = 18.3 in. d. b = 15.8 in.

Determine the normal stress at the critical load

A hollow brass rod is pin jointed and loaded in compression as shown. Knowing that the length L = 3 m, outside diameter D = 60 mm, and the wall thickness t = 10 mm, determine the critical load P. Use E = 105 GPa. Determine the normal stress at the critical load? a. 32.15 MPa b. 37.44 MPa c. 41.87 MPa d. 47.75 MPa The answer is not 32.15 MPa I have included a picture of the problem and the pages from my textbook that are supposed to be about this problem. Please show me the steps that you take to solve this problem.

D radius of curvature and second moment

The 6 x 12 inch timber beam has been strengthened by bolting to it the 5 x 1/2 inch brass reinforcement shown(the brass is as long as the 6 X 12 board). The modulus of elasticity for the wood is 1.75 X 10^6 psi and for the brass is 15 X 10^6 psi. The beam is bent about a horizontal axis by a couple M = 300 kip-in. (A) What is the radius of curvature of the composite beam? (B) And What is the second moment of area of the composite beam? Radius a. 925 ft b. 811 ft c. 734 ft d. 656 ft Second moment a. 1509.5 in^4 b. 1365.7 in^4 c. 1234.5 in^4 d. 1011.9in^4 I have included a picture of the problem and the pages from my textbook that are supposed to be... click for more

Determine the deflection

The rod ABC is made of steel (E = 29 X 10^6 psi). Determine the deflection at point B? a. 0.002 in b. 0.004 in c. 0.006 in d. 0.008 in The answer is not 0.006 in I have included a picture of the problem and the pages from my textbook that are supposed to be about this problem. Please show me the steps that you take to solve this problem.

Maximum shear stress and angle of rotation

Two solid steel shafts (G = 11.2 x 10^6 psi) are connected by the gears shown. Ends B and D are fixed. What is the angle through which end C rotates and What is the maximum shear stress in shaft CD under the loading shown? Angle a. 0.0167 rad b. 0.0302 rad c. 0.0459 rad d. 0.0573 rad shear a. 7.832 ksi b. 6.987 ksi c. 6.443 ksi d. 5.844 ksi The answer is not 6.443 ksi for shear and 0.0302 for the angle. I have included a picture of the problem and the pages from my textbook that are supposed to be about this problem. Please show me the steps that you take to solve this problem.