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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
The ends of a string weighing w/metre are attached to two points at the same horizontal level. If the central dip is very small, the horizontal tension of the string throughout is

wl²/8d
wl²/4d
wl/4d
wl²/16d

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Applied Mechanics and Graphic Statics
One Newton force, is

10⁴ dynes
10³ dynes
10⁶ dynes
10⁵ dynes

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Applied Mechanics and Graphic Statics
If the angle between the applied force and the direction of motion of a body, is between 90° and 180°, the work done, is called

Imaginary work
Zero work
Virtual work
Negative work

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Applied Mechanics and Graphic Statics
A bullet weighing 10 gm moves with a velocity of l km/sec. Its kinetic energy is (i) 5000 Nm (ii) 5000 kg.m (iii) 5000 J

Both (ii) and (iii)
Both (i) and (iii)
Only (ii)
All (i), (ii) and (iii)

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Applied Mechanics and Graphic Statics
A ball moving with a velocity of 5 m/sec impinges a fixed plane at an angle of 45° and its direction after impact is equally inclined to the line of impact. If the coefficient of restitution is 0.5, the velocity of the ball after impact will be

1.5 m/sec
3.5 m/sec
2.5 m/sec
0.5 m/sec

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