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Applied Mechanics and Graphic Statics

Applied Mechanics and Graphic Statics
If two equal forces of magnitude ‘P’ act at an angle ‘θ’, their resultant, will be

2P cos θ/2
P cos θ/2
P tan θ/2
2P sin θ/2

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Applied Mechanics and Graphic Statics
If the resultant of two forces ‘P’ and ‘Q’ acting at an angle ‘θ’ makes an angle ‘α’ with ‘P’, then tan α equals

Q sin θ/P + Q sin θ
Q sin θ/P + Q cos θ
P sin θ/P - Q cos θ
P sin θ/P + Q tan θ

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Applied Mechanics and Graphic Statics
A system of coplanar forces acting on a rigid body can be reduced to

One force only
One couple only
One force and one couple only
None of these

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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

0.55
0.4
0.5
0.3

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Applied Mechanics and Graphic Statics
Time period and length of a second’s pendulum respectively are

1 sec and 99.4 cm
2 sec and 99.4 cm
1 sec and 92.7 cm
2 sec and 92.7 cm

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Applied Mechanics and Graphic Statics
For a self-locking machine, the efficiency should be

Less than 60%
More than 50%
None of these
0.5

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