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Engineering Mechanics

Engineering Mechanics
The center of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.

4r/ 3π
3r/ 8
8r/3
3r/4π

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Engineering Mechanics
An ideal machine is one whose efficiency is

Between 60 and 70 %
Between 70 and 80%
Between 80 and 90%
1

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Engineering Mechanics
A particle inside a hollow sphere of radius r, having coefficient of friction µ can rest up to height of

0.134 r
r/2
r/A
r/3

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

ω/2π
2π × ω
π/ω
2π/ω

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Engineering Mechanics
The center of gravity of a quadrant of a circle lies along its central radius (r) at a distance of

0.6 r
0.7 r
0.5 r
0.8 r

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Engineering Mechanics
The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of α rad/s2, is

a = α.r
a = r / α
None of these
a = α/ r

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