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Engineering Mechanics

Engineering Mechanics
The periodic time (T) is given by (where, ω = Angular velocity of particle in rad/s.)

ω/2π
2π × ω
2π/ω
π/ω

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

n²
n
2n - 1
2n

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Engineering Mechanics
The centre of gravity of an isosceles triangle with base (p) and sides (q) from its base is

(4p² - q²)/6
(p² + q²)/4
[√(4p² - q²)]/6
(p² - q²)/4

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Engineering Mechanics
One kg force is equal to

12 N
8.9 N
7.8 N
9.8 N

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Engineering Mechanics
In order to completely specify angular displacement by a vector, it must fix

Magnitude of angular displacement
All of these
Sense of angular displacement
Direction of the axis of rotation

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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

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

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