Civil Engineering - Applied Mechanics

31. 

The resultant of two forces acting at right angles is 34 kg and acting at 60° is 70 kg. The forces are

A. 1 kg and 4 kg
B. 2 kg and 3 kg
C. 3 kg and 5 kg
D. 3 kg and 5 kg
E. 3 kg and 5 kg.

Answer: Option E

Explanation:

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32. 

The velocity of a body fallen from height h, on reaching the ground is given by

A. v = 2gh
B. v = 2gh2
C. v = 2gh
D. v = 1/2gh
E. h2/2g

Answer: Option C

Explanation:

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33. 

Two particles have been projected at angles 64° and 45° to the horizontal. If the velocity of projection of first is 10 m/sec, the velocity of projection of the other for equal horizontal ranges is

A. 9.3 m/sec
B. 8.3 m/sec
C. 7.3 m/sec
D. 6.3 m/sec.

Answer: Option A

Explanation:

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34. 

μ is coefficient of friction. A wheeled vehicle travelling on a circular level track will slip and overturn simultaneously if the ratio of its wheel distance to the height of its centroid, is

A. μ
B.
C.
D. μ.

Answer: Option B

Explanation:

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35. 

The necessary condition of equilibrium of a body, is :

A. algebraic sum of horizontal components of all the forces must be zero
B. algebraic sum of vertical components of all the forces must be zero
C. algebraic sum of the moments of the forces about a point must be zero
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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