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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

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

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Applied Mechanics and Graphic Statics
A satellite moves in its orbit around the earth due to

Gravitational force
Centripetal force
Centrifugal force
None of these

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Applied Mechanics and Graphic Statics
A string of length 90 cm is fastened to two points ‘A’ and ‘B’ at the same level 60 cm apart. A ring weighing 120 g is slided on the string. A horizontal force ‘P’ is applied to the ring such that it is in equilibrium vertically below ‘B’. The value of ‘P’ is:

40 g
100 g
80 g
60 g

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Applied Mechanics and Graphic Statics
Minimum pull in a suspended cable with supports at two ends is equal to

Horizontal thrust
Half the weight of the cable
Support reactions
Resultant of horizontal thrust and support reaction

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Applied Mechanics and Graphic Statics
If the radius of the earth is 600 km the height of a mountain above sea level at the top of which a beat seconds pendulum at sea level, looses 27 seconds a day, is

1500 meters
1000 meters
2000 meters
500 meters

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Applied Mechanics and Graphic Statics
One end of a light string 4 m in length is fixed to a point on a smooth wall and the other end fastened to a point on the surface of a smooth sphere of diameter 2.25 m and of weight 100 kg. The reaction between the sphere and the wall of the arrangement made is

102.5 kg
110 kg
105.5 kg
108.5 kg

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