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Applied Mechanics and Graphic Statics

Applied Mechanics and Graphic Statics
The resultant of two forces acting at right angles is 5 kgf and if they act at an angle of 60°, it is 37 kgf. The magnitudes of the forces are:

3 kgf, 4 kgf
5 kgf, 3 kgf
4 kgf, 5 kgf
2 kgf, 3 kgf

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Applied Mechanics and Graphic Statics
If the given forces P₁, P₂, P₃ and P₄ are such that the force polygon does not close, then the system will

Always reduce to a couple
Always reduce to a resultant force
Both (A) and (C)
Be in equilibrium

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Applied Mechanics and Graphic Statics
A glass ball is shot to hit a wall from a point on a smooth floor. If the ball returns back to the point of projection in twice the time taken in reaching the wall, the coefficient of restitution between the glass ball and the wall is

0.33
0.25
0.5
0.4

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Applied Mechanics and Graphic Statics
Coefficient of friction depends on

Nature of surfaces only
Both (A) and (B)
Area of contact only
None of these

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Applied Mechanics and Graphic Statics
Force polygon method is applicable for

A system of parallel forces only
Concurrent coplanar force system
Any coplanar force system
Non-concurrent coplanar force system

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Applied Mechanics and Graphic Statics
If ‘l’ is the span of a light suspension bridge who’s each cable carries total weight (w) and the central dip is ‘y’, the horizontal pull at each support, is

wl/2y
wl/4y
wl
wl/8y

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