Motion Clock-o-mania

Classical Mechanics Level 3

The seconds hand of a clock is moving with a uniform angular speed. The length of it's second's hand is 2 cm.

Find out the speed at the tip of the second's hand.

DETAILS AND ASSUMPTIONS:

  • Take the value of 'pi' as 22/7

  • Approximate the value to the, nearest hundredth decimal value.

  • please provide your answer in c m s e c o n d \dfrac{cm}{second}

For more problems see my set MOTION and GRAVITY


The answer is 0.21.

Sravanth C. by Sravanth C. , 21, India

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1 solution

Suprem S.Nalkund
Mar 16, 2015

s=d/t so..circumference of circle=2×22÷7×2=12.57 12.57÷60 =0.209

1 Helpful 0 Interesting 0 Brilliant 0 Confused

If the answer is 0.21, then in the question it MUST be mentioned that, the velocity is asked to give in (cm per second) and NOT in (meter per second). BUT, in the question it is Nowhere mentioned. We usually give answers in S.I. Unit. And, in S.I. Unit, The answer becomes (0.0021 Meter per second). What's wrong with that? Why have you posted the answer in (cm per second)? Why not in (meter per second)?

Rubayet Tusher - 6 years, 1 month ago

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Those who answered 0.0021 have been marked correct.

Calvin Lin Staff - 6 years ago

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Thank you very much Sir for your kind concern. Thank you again.

Rubayet Tusher - 6 years ago

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