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Engineering Mechanics

Engineering Mechanics
The process of finding out the resultant force is called __________ of forces.

Composition
Decomposition
Resolution
None of these

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

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Engineering Mechanics
If a number of forces are acting at a point, their resultant will be inclined at an angle 'θ' with the horizontal, such that

tanθ = ΣV × ΣH
tanθ = ΣV/ΣH
tanθ = ΣH/ΣV
tanθ = √(ΣV + ΣH)

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Engineering Mechanics
A machine having an efficiency greater than 50%, is known as

Non-reversible machine
Ideal machine
Neither reversible nor non-reversible machine
Reversible machine

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Engineering Mechanics
On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be

Upwards at its upper end
Zero at its upper end
Perpendicular to the wall at its upper end
Downwards at its upper end

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Engineering Mechanics
A particle moves along a straight line such that distance (x) traversed in 't' seconds is given by x = t² (t - 4), the acceleration of the particle will be given by the equation

6f - 8
6f - 4
6t² - 8t
3t² + 2t

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