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Applied Mechanics and Graphic Statics

Applied Mechanics and Graphic Statics
The condition of equilibrium for any system of forces in a plane is

That resultant couple must be zero
Both (A) and (B)
That polygon of forces must close
None of these

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Applied Mechanics and Graphic Statics
A heavy ladder resting on a floor and against a vertical wall may not be in equilibrium, if

Floor and wall both are smooth surfaces
Floor is smooth and the wall is rough
Floor is rough and the wall is smooth
Floor and wall both are rough surfaces

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Applied Mechanics and Graphic Statics
A uniform pyramid and a uniform prism of same height lie with their base on the surface. Which is more stable ?

None of these
pyramid
both equally stable
prism

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Applied Mechanics and Graphic Statics
One Newton force, is

10⁵ dynes
10³ dynes
10⁶ dynes
10⁴ dynes

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Applied Mechanics and Graphic Statics
On a ladder resisting on a smooth ground and leaning against a rough vertical wall, the force of friction acts

Away from the wall at its upper end
Downwards at its upper end
Towards the wall at its upper end
Upwards at its upper end

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Applied Mechanics and Graphic Statics
A string of length 90 cm is fastened to two points ‘A’ and ‘B’ at the same level 60 cm apart. A ring weighing 120 g is slided on the string. A horizontal force ‘P’ is applied to the ring such that it is in equilibrium vertically below ‘B’. The value of ‘P’ is:

100 g
60 g
40 g
80 g

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