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Question
A piece of stone tied at the end of a thread is whirled in a horizontal circle with uniform speed by hand. Answer the following questions:
- Is the velocity of stone uniform or variable?
- Is the acceleration of stone uniform or variable?
- What is the direction of acceleration of stone at any instant?
- Which force provides the centripetal force required for circular motion?
- Name the force and its direction which acts on the hand.
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Solution
- The stone's velocity varies as it is thrown in a circular motion.
- The acceleration of stone is variable
- The direction of acceleration of stone is towards the centre of the circular path.
- Force of tension in the string provides the centripetal force required for circular motion.
- The reaction of tension is away from the centre of the circular path.
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