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Engineering Mechanics

Engineering Mechanics
The moment of inertia of a sphere of mass 'm' and radius 'r', about an axis tangential to it, is

7mr²/3
2mr²/3
2mr²/5
7mr²/5

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

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

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Engineering Mechanics
The acceleration of a particle moving with simple harmonic motion, at any instant is given by

ω.y
ω2/y
ω3.y
ω2.y

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Engineering Mechanics
An ideal machine is one whose efficiency is

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

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Engineering Mechanics
The forces, whose lines of action are parallel to each other and act in the same directions, are known as

Coplanar non-concurrent forces
Unlike parallel forces
Like parallel forces
Coplanar concurrent forces

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