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Engineering Mechanics

Engineering Mechanics
The moment of inertia of a square of side (a) about an axis through its center of gravity is

a4/36
a4/8
a4/4
a4/12

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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

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

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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

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

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Engineering Mechanics
The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as

Like parallel forces
Unlike parallel forces
Coplanar concurrent forces
Coplanar non-concurrent forces

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Engineering Mechanics
One joule is equal to

10 N-m
0.1 N-m
1 N-m
100 N-m

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Engineering Mechanics
The maximum efficiency of a screw jack is

(1 + sinφ)/(1 - sinφ)
(1 - tanφ)/(1 + tanφ)
(1 + tanφ)/(1 - tanφ)
(1 - sinφ)/(1 + sinφ)

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