Civil Engineering - Applied Mechanics

21. 

According to Kennedy's theorem, if three bodies have plane motions, their instantaneous centres lie on

A. a point
B. a straight line
C. two straight lines
D. a triangle.

Answer: Option B

Explanation:

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22. 

A ball of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/sec hits an identical stationary ball B on the table. If the impact is perfectly plastic, the velocity of the ball B just after impact would be

A. zero
B. 5 m/sec
C. 10 m/sec
D. none of these.

Answer: Option A

Explanation:

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23. 

If α is the angular acceleration of a compound pendulum whose angular displace ment is θ, the frequency of the motion is

A. α/θ
B.
C. α/θ
D. α - θ.

Answer: Option B

Explanation:

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24. 

If two forces each equal to T in magnitude act at right angles, their effect may be neutralised by a third force acting along their bisector in opposite direction whose magnitude will be

A. 2 T
B. 1/2 T
C. 2 T
D. 3 T
E. none of these.

Answer: Option C

Explanation:

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25. 

Energy may be defined as

A. power of doing work
B. capacity of doing work
C. rate of doing work
D. all the above.

Answer: Option B

Explanation:

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