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Engineering Mechanics

Engineering Mechanics
The center of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.

8r/3
4r/ 3π
3r/4π
3r/ 8

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Engineering Mechanics
The unit of moment of inertia of an area is

m4
kg-m-s2
kg-m2
kg/m2

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Engineering Mechanics
The C.G. of a solid hemisphere lies on the central radius 3r

At distance — from the plane base 3r
At distance — from the plane base
At distance — from the plane base 3r
At distance — from the plane base 3r

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Engineering Mechanics
A ladder is resting on a rough ground and leaning against a smooth vertical wall. The force of friction will act

Zero at its upper end
Perpendicular to the wall at its upper end
Upward at its upper end
Downward at its upper end

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Engineering Mechanics
According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through center of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)

IP = IG - Ah2
IP = Ah2 / IG
IP = IG / Ah2
IP = IG + Ah2

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Engineering Mechanics
The angle between two forces when the resultant is maximum and minimum respectively are

180° and 0°
90° and 0°
90° and 180°
0° and 180°

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MORE MCQ ON Engineering Mechanics

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