1- When an object has an axis of symmetry, the centroid of the area must lie on

Question

1-
When an object has an axis of symmetry, the centroid of the area must lie on that axis.

true
false

2-Direct integration is the best way to determine centroids and moments of inertia for most composite areas.

true
false

3- The parallel axis theorem for moments of inertia gives the relationship for moments of inertia between any two parallel axes.

true
false

4-Normal stress is defined as the force per unit area perpendicular to a surface.
true
false

5-A static test of a specimen implies that loads are being applied slowly (over minutes rather than over seconds or less).

true
false

6- Stress-strain diagrams are essentially the same general shape for most materials used in engineered construction.

true
false

7-The term relaxation is used to describe the "permanent" deformation of a material after the material has been heavily loaded for a short time.

true
false

8-Hooke’s law strictly applies only to the initial "linear" portion of the stress-strain curve for uniaxial loads.

true
false

9-Poisson’s ratio is the ratio of the lateral strain to the axial strain for an axially loaded bar specimen operating in the elastic range.

true
false

10-Double shear refers to the situation in which an object is loaded and unloaded in shear two times in a relatively short period of time.

true
false

Explanation / Answer

1-
When an object has an axis of symmetry, the centroid of the area must lie on that axis.

true


2-Direct integration is the best way to determine centroids and moments of inertia for most composite areas.

true

3- The parallel axis theorem for moments of inertia gives the relationship for moments of inertia between any two parallel axes.

false

4-Normal stress is defined as the force per unit area perpendicular to a surface.

true

5-A static test of a specimen implies that loads are being applied slowly (over minutes rather than over seconds or less).

false

6- Stress-strain diagrams are essentially the same general shape for most materials used in engineered construction.
false

7-The term relaxation is used to describe the "permanent" deformation of a material after the material has been heavily loaded for a short time.

false

8-Hooke’s law strictly applies only to the initial "linear" portion of the stress-strain curve for uniaxial loads.

true 9-Poisson’s ratio is the ratio of the lateral strain to the axial strain for an axially loaded bar specimen operating in the elastic range.

true

10-Double shear refers to the situation in which an object is loaded and unloaded in shear two times in a relatively short period of time.

false 9-Poisson’s ratio is the ratio of the lateral strain to the axial strain for an axially loaded bar specimen operating in the elastic range.

true

10-Double shear refers to the situation in which an object is loaded and unloaded in shear two times in a relatively short period of time.

false

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