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Lesson 5. SOLVING NUMERICAL
Module 1. Statics and dynamics
Lesson 5 SOLVING NUMERICAL 5.1 Problem Find the moment of inertia of a hollow rectangular section about its Centre of gravity, if the external dimensions are breadth 6 cm, depth 8 cm and internal dimension are breadth 3 cm and depth 4 cm respectively. Sol. Outer breadth b = 6cm Inner breadth b_{1} = 3cm Outer depth d = 8cm Inner depth d_{1} = 4cm Using the relation Fig. 5.1 = 25616 = 240 cm^{4}
5.2 Problem Find the M.I of rectangular section shown in fig. about faces AB & BC b = 4cm d = 6cm M.I about AB Fig. 5.2 M.I of the section about an axis through its C.G and parallel to x – x axis

Last modified: Thursday, 27 September 2012, 9:47 AM