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Engineering Mechanics

Engineering Mechanics
The velocity ratio for the third system of pulleys is

2n
n²
n
2n - 1

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Engineering Mechanics
A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is (where, M = Mass of the body, and S = Sum of the squares of the two semi-axes.)

MS/4
MS/3
None of these
MS/5

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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

db³/36
db³/12
bd³/36
bd³/12

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Engineering Mechanics
In order to determine the effects of a force, acting on a body, we must know

Line of action of the force
Nature of the force i.e. whether the force is push or pull
Magnitude of the force
All of these

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Engineering Mechanics
If the body falls freely under gravity, then the gravitational acceleration is taken as

+9.8 m/s2
-9.8 m/s2
+8.9 m/s2
-8.9 m/s2

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Engineering Mechanics
A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act

Towards the wall at its upper end
Away from the wall at its upper end
Downward at its upper end
Upward at its upper end

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