Question

Consider the motion of the tip of the hours hand of a clock. After 12 hours

1) Distance covered is zero
2) Displacement is zero
3) Average velocity is zero
4) Average speed is zero
a) 1, 3 are true
b) 1, 4 are true
c) 2,4 are true
d) 2,3 are true​

Answer 1

★ Answer :

Given , the clock rotates for 12 hrs that means the tip of the hours hand made one round around the clock.

That means the tip of the hours hand covers a distance of 2πr . So , point no. 1 is incorrect.

Here , the tip of the hours hand starts and comes to the same place so displacement is zero. So , point no. 2 is correct.

Here ,

Average velocity = Displacement/total time

Already Given that displacement = 0

So ,

Average velocity = 0/time

Average velocity = 0 m/s

So , point no. 3 is correct

Here ,

Average speed = total distance/total time

Already given that distance = 2πr

Average speed = 2πr/time = something measurable value

So , point no. 4 is incorrect

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Here , by the given information points no. 2 & 3 are correct !

Hence , option d) is your answer