Civil Engineering - Applied Mechanics

Exercise : Applied Mechanics - Section 1

41.

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

50%

40%

55%

30%.

Answer: Option

Explanation:

No answer description is available. Let's discuss.

42.

Maximum efficiency of a screw jack for the angle of friction φ, is

Answer: Option

Explanation:

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43.

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

60 g

80 g

100 g.

Answer: Option

Explanation:

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44.

The reaction at the support A of the beam shown in below figure is

2 t

5.8 t

0.2 t

3.5 t.

Answer: Option

Explanation:

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45.

u₁ and u₂ are the velocities of approach of two moving bodies in the same direction and their corresponding velocities of separation are v₁ and v₂. As per Newton's law of collision of elastic bodies, the coefficient of restitution (e) is given by