# Civil Engineering - Applied Mechanics

### Exercise :: Applied Mechanics - Section 4

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.

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.

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. 2πα/θ B. C. 4πα/θ D. 2πα - θ.

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.

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.