1. For a particular work, it is desired to build a "coffin" type beam. The following figure shows the typology of this beam, with its dimensions in centimeters. With this, determine the moment of inertia of the element about the axis of its center of gravity. Question 1 options: a) The total moment of inertia of the section is 128 ??4. b) The total moment of inertia of the section is 1152 ??4. c) The total moment of inertia of the section is 1146 ??4. d) The total moment of inertia of the section is 2048 ??4. e) The total moment of inertia of the section is 1024 ??4.
1. For a particular work, it is desired to build a "coffin" type beam. The following figure shows the typology of this beam, with its dimensions in centimeters. With this, determine the moment of inertia of the element about the axis of its center of gravity.
Question 1 options:
a) The total moment of inertia of the section is 128 ??4.
b) The total moment of inertia of the section is 1152 ??4.
c) The total moment of inertia of the section is 1146 ??4.
d) The total moment of inertia of the section is 2048 ??4.
e) The total moment of inertia of the section is 1024 ??4.
2. For a certain bridge project that is being evaluated, it was decided, at first, to use an I-section beam, as shown in the following image. Considering the given dimensions and the orientation of the Cartesian axes, we ask: what is the value of the static moment, or first order moment, of the cross section, in cm³?
HASSE, D. Geometric characteristics of plane figures. São José dos Campos: Workbook on the resistance of materials, 2010.
Question 2 options:
a) The static moment of the section is 555.85 cm³.
b) The static moment of the section is 385.95 cm³.
c) The static moment of the section is 456.90 cm³.
d) The static moment of the section is 512.25 cm³.
e) The static moment of the section is 488.75 cm³.
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