Situation - Wooden log is used to bridge a 2.5-m gap. The bridge will support a concentrated load of 26-kN. The allowable bending and shearing stresses of wood are 6.7 MPa and 1.3 MPa, respectively. Neglect the weight of the log. 12. Determine the minimum log diameter (mm) based on shear. А. 180 В. 200 С. 190 D. 210 13. Determine the minimum log diameter (mm) based on bending. A. 310 В. 290 С. 300 D. 280 14. If a rectangular log is used with width of 150 mm, select the minimum depth to support the given load. A. 290 В. 350 С. 300 D. 330

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Moment of Inertia

Inertia can be termed as a resistance offered by a body to change its state. A rigid body initially at rest will apply resistance when acted by an external force that tends to change its state of rest or velocity, or a body initially at motion will provide resistance in changing its state of velocity or motion for coming to a state of rest. In other words, Newton's first law of motion describes the law of inertia of a rigid body.