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Applied Mechanics and Graphic Statics

Applied Mechanics and Graphic Statics
The equation of motion of a particle starting from rest along a straight line is x = t³ - 3t²+ 5. The ratio of the accelerations after 5 sec and 3 sec will be

5
4
2
3

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

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Applied Mechanics and Graphic Statics
If two forces of 3 kg and 4 kg act at right angles to each other, their resultant force will be equal to

1 kg
5 kg
7 kg
None of these

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Applied Mechanics and Graphic Statics
If two forces P and Q (P > Q) act on the same straight line but in opposite direction, their resultant, is

P - Q
P + Q
P/Q
Q/P

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Applied Mechanics and Graphic Statics
The condition of equilibrium for any system of forces in a plane is

Both (A) and (B)
That polygon of forces must close
That resultant couple must be zero
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 mechanical advantage of the lifting machine is

20
15
26
18

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