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Engineering Mechanics

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
0.8 r
0.7 r
0.5 r

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Engineering Mechanics
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as

Newton's first law of motion
None of these
Newton's second law of motion
Newton's third law of motion

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Engineering Mechanics
The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by (where, r = Amplitude of motion, and y = Displacement of the particle from mean position.)

ω.√(r² - y²)
ω².√(r² - y²)
ω.√(y² - r²)
ω².√(y² - r²)

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Engineering Mechanics
The unit of work in S.I. units is

Newton
kg-m
erg
joule

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Engineering Mechanics
Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to

None of these
Area of the triangle
Twice the area of the triangle
Half the area of the triangle

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Engineering Mechanics
The centre of gravity of a right circular solid cone is at a distance of _________ from its base, measured along the vertical axis.(where h = Height of a right circular solid cone.)

h/4
h/2
h/6
h/3

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