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Engineering Mechanics

Engineering Mechanics
Tension in the cable supporting a lift is more when the lift is moving __________ with an acceleration.

Upwards
Downwards
None of these
Horizontal

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Engineering Mechanics
The forces, whose lines of action are parallel to each other and act in the same directions, are known as

Unlike parallel forces
Like parallel forces
Coplanar non-concurrent forces
Coplanar concurrent forces

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

16 cm4
12 cm4
20 cm4
9 cm4

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Engineering Mechanics
Whenever a force acts on a body and the body undergoes a displacement, then

None of these
Work is said to be done
Body has kinetic energy of translation
Power is being transmitted

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Engineering Mechanics
The matter contained in a body, is called

Momentum
Mass
Weight
Impulsive force

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