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Engineering Mechanics

Engineering Mechanics
If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is

120°
30°
90°
60°

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Engineering Mechanics
Two forces are acting at an angle of 120°. The bigger force is 40 N and the resultant is perpendicular to the smaller one. The smaller force is

120 N
40 N
20 N
None of the listed here

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Engineering Mechanics
The centre of gravity a T-section 100 mm × 150 mm × 50 mm from its bottom is

87.5 mm
50 mm
125 mm
75 mm

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Engineering Mechanics
The point, through which the whole weight of the body acts, irrespective of its position, is known as

Center of gravity
Center of mass
Center of percussion
Moment of inertia

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Engineering Mechanics
Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the depth (d), is

db³/12
bd³/12
bd³/36
db³/36

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Engineering Mechanics
The angle between two forces when the resultant is maximum and minimum respectively are

90° and 0°
0° and 180°
180° and 0°
90° and 180°

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