PHYSICS | STANDARD IXQuestion ID 230089
An athlete takes 't' seconds to complete one round of a circular track of radius 'r' . Write an expression for his velocity, if he is in uniform circular motion. Give 2 more examples if the same type of motion...

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CJ

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Solution

Acerage velocity = distance / time = (2πr) / t
examples
revolution of earth, movemont of blades of the fan, hands of clock, movement of a marrygo round ,running of n athelete on a circular track with a uniform velocity

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An athlete completes one round of a circular track of radius R in 40 sec . What will be his displacement at the end of 2 minutes 20seconds?

R

40

s e c

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\frac{v}{2}

\frac{π R}{t}

\frac{π R}{t}

Examples of uniform circular motion are_______

a)movement of blades of a fan around a hub

b)runn run of an athlete on a circular track with constant velocity

c)merry -go-round in a children's park

d)revolution of earth around sun

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