I am a teacher and need help creating exam problems. Please recommend more incorrect answers to the following problem but do not explain your logic. At a point subjected to plane stress on the surface of a compressed air cylinder, the stresses are σx = –80 MPa, σy = 40 MPa, and τxy = –80 MPa. Determine shear stress τnt at the point for a counterclockwise coordinate rotation of 52°.

Create 5 variations of the following problem but do not show the answers. At a point on the free surface of a steel automotive component [E = 28,400 ksi,ν = 0.18], a strain rosette was used to obtain normal strains of εa = 109 με, εb = –485 με, and εc = 299 με. Determine normal strain εx at the point.

I am a teacher and need help creating exam problems. Please recommend more incorrect answers to the following problem but do not explain your logic. At a point subjected to plane stress on the surface of a compressed air cylinder, the stresses are σx = –10 MPa, σy = –60 MPa, and τxy = –40 MPa. Determine normal stress σt at the point for a clockwise coordinate rotation of 53°.

I am a teacher and need help creating exam problems. Please recommend more incorrect answers to the following problem but do not explain your logic. At a point subjected to plane stress on the surface of a compressed air cylinder, the stresses are σx = –8 ksi, σy = 2 ksi, and τxy = –26 ksi. Determine normal stress σt at the point for a clockwise coordinate rotation of 71°.

I am a teacher and need help creating exam problems. Please recommend more incorrect answers to the following problem but do not explain your logic. At a point in a body subjected to plane strain, the strains are εx = 111 με, εy = 691 με, and γxy = 650 μrad. Determine the center εcenter of the corresponding in-plane Mohr’s circle.

Create 5 variations of the following problem but do not show the answers. At a point subjected to plane stress on the surface of a backhoe, the stresses are σx = –12 ksi, σy = 3 ksi, and τxy = –14 ksi. Determine the angle θp corresponding to the orientation of the principal planes at the point.

Create 5 variations of the following problem but do not show the answers. At a point subjected to plane stress on the surface of a gusset plate, the stresses are σx = –8 ksi, σy = 9 ksi, and τxy = 9 ksi. Determine principal stress σp1 at the point.

Create 5 variations of the following problem but do not show the answers. Does the orientation of the shear stress arrows in the following image indicate that they are positive or negative?

I am a teacher and need help creating exam problems. Please recommend more incorrect answers to the following problem but do not explain your logic. At a point in a body subjected to plane strain, the strains are εx = 406 με, εy = 455 με, and γxy = –700 μrad. Determine the center εcenter of the corresponding in-plane Mohr’s circle.

I am a teacher and need help creating exam problems. Please recommend more incorrect answers to the following problem but do not explain your logic. At a point in a body subjected to plane strain, the strains are εx = 630 με, εy = 470 με, and γxy = 210 μrad. Determine the angle θs corresponding to the orientation of the maximum in-plane shear strain at the point.