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Engineering Mechanics

Engineering Mechanics
If the gravitational acceleration at any place is doubled, then the weight of a body will be

g/2
g
√2.g
2g

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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
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

mr²/6
mr²/8
mr²/2
mr²/4

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Engineering Mechanics
The unit of force in S.I. system of units is

Newton
Dyne
Watt
Kilogram

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Engineering Mechanics
When a body falls freely under gravitational force, it possesses __________ weight.

No
Maximum
None of these
Minimum

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Engineering Mechanics
Two forces are acting at an angle of 120°. The bigger force is 40 N and the resultant is perpendicular to the smaller one. The smaller force is

None of the listed here
20 N
40 N
120 N

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