For each of the questions below, choose the best answer. The stress matrix and associated principal stresses are as given. Using this information choose the closest correct answer to 3 significant figures.

Name

Email

1) The first stress invariant is

60.0 ksi

-60.0 ksi

40.0 ksi

-40.0 ksi

None of the above

2) The second stress invariant is

100.0 ksi^{2}

1,100.0 ksi^{2}

-1,100.0 ksi^{2}

500.0 ksi^{2}

None of the above

3) The third stress invariant is

6,000.0 ksi^{3}

60,000.0 ksi^{3}

600.0 ksi^{3}

8,000.0 ksi^{3}

None of the above

4) The stress σ_{xx} is

22.0 ksi (T)

22.0 ksi (C)

Zero

17.5 ksi (T)

None of the above

5) The maximum shear stress is

25.0 ksi

60.0 ksi

40.0 ksi

50.0 ksi

None of the above

6) The octahedral normal stress is

20.0 ksi (T)

20.0 ksi (C)

13.3 ksi (C)

13.3 ksi (T)

None of the above

7) The magnitude of octahedral shear stress is

17.0 ksi

16.0 ksi

18.0 ksi

20.0 ksi

None of the above

8) The magnitude of the stress vector on the plane whose outward normal makes the angle of 90^{o}, 45^{o}, 45^{o} to the principal coordinates is

14.4 ksi

21.21 ksi

15.81 ksi

17.15 ksi

None of the above

9) The magnitude of normal stress on the plane whose outward normal makes the angle of 90^{o}, 45^{o}, 45^{o} to the principal coordinates is

10.0 ksi

12.0 ksi

20.0 ksi

5.0 ksi

None of the above

10) The magnitude of shear stress on the plane whose outward normal makes an angle of 90^{o}, 45^{o}, 45^{o} to the principal coordinates is

10.0 ksi

15.0 ksi

25.0 ksi

21.21 ksi

None of the above

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