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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.

3r/4π
3r/ 8
4r/ 3π
8r/3

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Engineering Mechanics
One kg force is equal to

8.9 N
7.8 N
12 N
9.8 N

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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

mr²/8
mr²/4
mr²/2
mr²/6

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Engineering Mechanics
On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be

Downwards at its upper end
Towards the wall at its upper end
Away from the wall at its upper end
Upwards at its upper end

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Engineering Mechanics
The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by

P - Q
P / Q
Q / P
P + Q

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Engineering Mechanics
The rate of doing work is known as

Potential energy
Kinetic energy
None of these
Power

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