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Engineering Mechanics

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

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

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Engineering Mechanics
An ideal machine is one whose efficiency is

Between 60 and 70 %
Between 80 and 90%
1
Between 70 and 80%

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Engineering Mechanics
The horizontal range of a projectile (R) is given by

R = u² cos2α/g
R = u² sinα/g
R = u² cosα/g
R = u² sin2α/g

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Engineering Mechanics
The acceleration of a body sliding down an inclined surface is

g tanθ
g cosθ
None of these
g sinθ

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Engineering Mechanics
The periodic time of one oscillation for a simple pendulum is (where l = Length of the pendulum.)

(1/2π). √(l/g)
None of these
(1/2π). √(g/l)
2π. √(l/g)

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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 width (b), is

bd³/36
db³/12
db³/36
bd³/12

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