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Engineering Mechanics

Engineering Mechanics
The unit of angular acceleration is

m/s
N-m
m/s2
rad/s2

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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
According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through center of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)

IP = IG / Ah2
IP = Ah2 / IG
IP = IG - Ah2
IP = IG + Ah2

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Engineering Mechanics
Coplanar non-concurrent forces are those forces which __________ at one point, but their lines of action lie on the same plane.

Either ‘A’ or ‘B’
Meet
None of these
Do not meet

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

2mr²/3
7mr²/3
7mr²/5
2mr²/5

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Engineering Mechanics
The coefficient of friction depends upon

Area of contact
Nature of surfaces
All of these
Shape of the surfaces

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