Mechanical Engineering - Engineering Mechanics

26. 

The moment of inertia of a thin rod of mass m and length l,about an axis through its centre of gravity and perpendicular to its length is

A. ml2/4
B. ml2/ 6
C. ml2/8
D. ml2/12

Answer: Option D

Explanation:

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27. 

When a body of mass m attains a velocity v from rest in time t, then the kinetic energy of translation is

A. mv2
B. mgv2
C. 0.5 mv2
D. 0.5 mgv2

Answer: Option C

Explanation:

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28. 

The unit of angular velocity is

A. m/min
B. rad/s
C. revolutions/min
D. both (B) and (C)
E. none of these

Answer: Option D

Explanation:

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29. 

If a number of forces are acting at a point, their resultant is given by

A. (∑V)2 + (∑H)2
B.
C. (∑V)2 +(∑H)2 +2(∑V)(∑H)
D.

Answer: Option B

Explanation:

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30. 

A force acting in the opposite direction to the motion of the body is called force of friction.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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