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Engineering Mechanics

Engineering Mechanics
The resultant of two equal forces ‘P’ making an angle ‘θ’, is given by

2P cotθ/2
2P tanθ/2
2P sinθ/2
2P cosθ/2

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Engineering Mechanics
The moment of inertia of a thin rod of mass 'm' and length 'l', about an axis through its centre of gravity and perpendicular to its length is

ml2/8
ml2/12
ml2/4
ml2/ 6

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Engineering Mechanics
The maximum height of a projectile on a horizontal plane, is

u² sin²α/2g
u² cos²α/g
u² cos²α/2g
u² sin²α/g

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Engineering Mechanics
The range of projectile on a downward inclined plane is ________ the range on upward inclined plane for the same velocity of projection and angle of projection.

Less than
None of These
More than
Equal to

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Engineering Mechanics
Centre of gravity of a solid cone lies on the axis at the height

Three eighth of the total height above the base
One fourth of the total height above base
One-half of the total height above base
One third of the total height above base

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Engineering Mechanics
A machine having an efficiency greater than 50%, is known as

Ideal machine
Reversible machine
Neither reversible nor non-reversible machine
Non-reversible machine

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