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Engineering Mechanics

Engineering Mechanics
The velocity ratio for the first system of pulleys is (where n is the number of pulleys.)

2n - 1
n
n²
2n

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Engineering Mechanics
If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is

g/2
g/3
None of these
g/4

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

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Engineering Mechanics
Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its vertex and parallel to the base, is __________ than that passing through its C.G. and parallel to the base.

Six times
Four times
Nine times
Two times

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Engineering Mechanics
Center of gravity of a thin hollow cone lies on the axis at a height of

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

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Engineering Mechanics
If a number of coplanar forces acting at a point be in equilibrium, the sum of clockwise moments must be __________ the sum of anticlockwise moments, about any point.

None of these
Less than
Equal to
Greater than

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