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Engineering Mechanics

Engineering Mechanics
Moment of inertia of a triangular section of base (b) and height (h) about an axis through its base, is

bh3/4
bh3/8
bh3/36
bh3/12

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Engineering Mechanics
The time of flight (t) of a projectile on an upward inclined plane is(where u = Velocity of projection, α = Angle of projection, and β = Inclination of the plane with the horizontal.)

t = 2u sin (α - β)/g cos β
t = 2u sin (α + β)/g cos β
t = g cos β/2u sin (α + β)
t = g cos β/2u sin (α - β)

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Engineering Mechanics
Two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N. It the line of action of the resultant is 6 mm from any given force, the two forces are

15 N and 15 N
15 N and 5 N
None of these
20 N and 5 N

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Engineering Mechanics
The matter contained in a body, is called

Impulsive force
Momentum
Weight
Mass

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Engineering Mechanics
The moment of inertia of a solid sphere of mass ‘m’ and radius ‘r’ is

mr²/2
2mr²/5
mr²
2mr²/3

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Engineering Mechanics
Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to

None of these
Half the area of the triangle
Twice the area of the triangle
Area of the triangle

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