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Engineering Mechanics

Engineering Mechanics
The center of gravity of a quadrant of a circle lies along its central radius (r) at a distance of

0.8 r
0.7 r
0.6 r
0.5 r

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Engineering Mechanics
The moment of inertia of a thin disc of mass ‘m’ and radius ‘r’, about an axis through its center of gravity and perpendicular to the plane of the disc is

mr²/6
mr²/4
mr²/8
mr²/2

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Engineering Mechanics
The moment of inertia of a solid cone of mass ‘m’ and base radius ‘r’ about its vertical axis is

4mr²/5
2mr²/5
3mr²/10
3mr²/5

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Engineering Mechanics
The forces, which meet at one point, but their lines of action do not lie in a plane, are called

Coplanar non-concurrent forces
Non-coplanar non-concurrent forces
Intersecting forces
Non-coplanar concurrent forces

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Engineering Mechanics
Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its C.G. and parallel to the base, is

bh3/12
bh3/4
bh3/8
bh3/36

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Engineering Mechanics
The centre of gravity of a uniform lamina lies at

The midpoint of its axis
The bottom surface
The centre of heavy portion
All of these

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