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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

9 cm4
12 cm4
20 cm4
16 cm4

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Engineering Mechanics
The unit of angular acceleration is

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

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Engineering Mechanics
The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of α rad/s2, is

a = r / α
None of these
a = α.r
a = α/ r

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Engineering Mechanics
The centre of percussion of the homogeneous rod of length ‘L’ suspended at the top will be

L/2
2L/3
L/3
3L/4

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

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

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