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Applied Mechanics and Graphic Statics

Applied Mechanics and Graphic Statics
Maximum efficiency of a screw jack for the angle of friction θ, is

(1 + sin θ)/(1 - sin θ)
(1 - sin θ)/(1 + sin θ)
(1 - sin θ)/sin θ
sin θ/(1 + sin θ)

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Applied Mechanics and Graphic Statics
For lifting a load of 50 kg through a distance of 2.5 cm, an effort of 12.5 kg is moved through a distance of 40 cm. The efficiency of the lifting machine, is

0.65
0.75
0.7
0.6

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Applied Mechanics and Graphic Statics
A cube on a smooth horizontal surface

Cannot be in unstable equilibrium
Can be in any of these states
Cannot be in neutral equilibrium
Cannot be in stable equilibrium

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Applied Mechanics and Graphic Statics
The length of a Second's pendulum, is

101 cm
99.0 cm
99.4 cm
100 cm

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Applied Mechanics and Graphic Statics
If a flywheel increases its speed from 10 rpm to 20 rpm in 10 seconds, then its angular acceleration is

None of these
—rad/sec 30
—rad/sec 20
—rad/sec 10

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

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

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