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Applied Mechanics and Graphic Statics

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
0.33
0.67

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Applied Mechanics and Graphic Statics
The tension in a cable supporting a lift

Remains constant whether its moves downwards or upwards
Is more when the lift is moving downwards
Is less when the lift is moving downwards
Is less when the lift is moving upwards

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Applied Mechanics and Graphic Statics
A trolley wire weighs 1 kg per metre length. The ends of the wire are attached to two poles 20 m apart. If the horizontal tension is 1000 kg, the central dip of the cable is

3 cm
2 cm
4 cm
5 cm

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Applied Mechanics and Graphic Statics
A 2 m long ladder rests against a wall and makes an angle of 30° with the horizontal floor. Where will be the instantaneous center of rotation when the ladder starts slipping ? i. 1.0 in from the wall ii. 1.732 m from the wall iii. 1.0 m above the floor iv. 1.732 m above the floor The correct answer is

(ii) and (iv)
(i) and (iii)
(i) and (iv)
(ii) and (iii)

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Applied Mechanics and Graphic Statics
The moment of inertia of a triangular section (base b, height h) about centroidal axis parallel to the base, is

b³h/12
bh³/36
bh³/2
bh³/3

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Applied Mechanics and Graphic Statics
A rigid body is in a stable equilibrium if the application of any force

None of above
Neither raises nor lowers the CG of the body
Can raise the CG of the body but cannot lower it
Tends to lower the CG of the body

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