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Engineering Mechanics

Engineering Mechanics
The coefficient of friction depends upon

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

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Engineering Mechanics
If ‘P’ is the force acting on the body, ‘m’ is the mass of the body and ‘a’ is the acceleration of the body, then according to Newton's second law of motion,

P/m.a = 0
P - m.a = 0
P × m.a = 0
P + m.a = 0

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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
mr²/2
mr²/8
mr²/4

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Engineering Mechanics
A redundant frame is also called __________ frame.

None of these
Imperfect
Deficient
Perfect

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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

9 cm4
12 cm4
20 cm4
16 cm4

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Engineering Mechanics
The range of projectile will be maximum for a given velocity of projectile, when the angle of projection (α) is

β/2
30° + β/2
45° + β/2
60° + β/2

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