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Applied Mechanics and Graphic Statics

Applied Mechanics and Graphic Statics
The condilion for a lifting machine to be reversible is that its efficiency should be

less than 50%
more than 50%
equal to 100%
more than 66.67%

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Applied Mechanics and Graphic Statics
The locus of the instantaneous centre of a moving rigid body, is

Involute
Spiral
Centroid
Straight line

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Applied Mechanics and Graphic Statics
If the angle between the applied force and the direction of motion of a body, is between 90° and 180°, the work done, is called

Zero work
Negative work
Imaginary work
Virtual work

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Applied Mechanics and Graphic Statics
A particle is dropped from the top of a tower 60 m high and another is projected upwards from the foot of the tower to meet the first particle at a height of 15.9 m. The velocity of projection of the second particle is

16 m/sec
22 m/sec
18 m/sec
20 m/sec

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Applied Mechanics and Graphic Statics
A ball is dropped from a height of 2.25 m on a smooth floor and rises to a height of 1.00 m after the bounce. The coefficient of restitution between the ball and the floor is

0.57
0.44
0.67
0.33

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Applied Mechanics and Graphic Statics
M.I. of a thin ring (external diameter D, internal diameter d) about an axis perpendicular to the plane of the ring, is

π/32 (D⁴ + d⁴)
π/32 (D⁴ - d⁴)
π/64 (D⁴ + d⁴)
π/32 (D⁴ × d⁴)

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