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Q.

Which of the following is an example of rotational motion?


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a

The moon revolving around the earth.

b

The earth rotating about its own axis.

c

The earth revolving around the sun.

d

The bob of a swinging pendulum. 

answer is B.

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Detailed Solution

The earth rotating about its own axis is an example of rotational motion. This is because when it is in motion every point in the object traverses a circular path about an axis which is rotational motion. Therefore the moon revolving around the earth is periodic motion, the earth revolving around the sun is circular motion and the bob of a swinging pendulum is oscillatory motion.
 
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Which of the following is an example of rotational motion?