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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%
more than 50%
more than 66.67%
less than 50%

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Applied Mechanics and Graphic Statics
A stone is thrown vertically upwards with a vertical velocity of 49 m/sec. It returns to the ground in

20 sec
5 sec
10 sec
8 sec

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Applied Mechanics and Graphic Statics
A load of 500 kg was lifted through a distance of 13 cm. by an effort of 25 kg which moved through a distance of 650 cm. The efficiency of the lifting machine is

0.5
0.4
0.55
0.3

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Applied Mechanics and Graphic Statics
If a particle is projected inside a horizontal tunnel which is 554 cm high with a velocity of 60 m per sec, the angle of projection for maximum range, is

8°
9°
11°
10°

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Applied Mechanics and Graphic Statics
A shell of mass 100 kg travelling with a velocity of 10 m/sec breaks into two equal pieces during an explosion which provides an extra kinetic energy of 20000 Joules. If the pieces continue to move in the same direction as before, then the speed of the faster one must be

20 m/sec
30 m/sec
50 m/sec
40 m/sec

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Applied Mechanics and Graphic Statics
The unit of force in C.G.S. system of units, is called

Newton
Kg
Dyne
All of these

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