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Engineering Mechanics

Engineering Mechanics
The moment of inertia of a rectangular section 3 cm wide and 4 cm deep about X-X axis is

20 cm4
12 cm4
16 cm4
9 cm4

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Engineering Mechanics
The velocity ratio of a simple wheel and axle with D and d as the diameters of effort wheel and load axle, is

D / d
D + d
D - d
D × d

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Engineering Mechanics
The moment of inertia of a thin disc of mass ‘m’ and radius ‘r’, about an axis through its center of gravity and perpendicular to the plane of the disc is

mr²/2
mr²/8
mr²/6
mr²/4

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Engineering Mechanics
The time of flight of a projectile on downward inclined plane depends upon

None of these
Angle of projection
Angle of inclination of the plane
Both (A) and (B)

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Engineering Mechanics
The law of motion involved in the recoil of gun is

Newton's first law of motion
Newton's second law of motion
None of these
Newton's third law of motion

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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/3
MS/4
MS/5
None of these

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