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A gramophone disc rotates at 60 rpm . A ...

A gramophone disc rotates at 60 rpm . A coin of mass 18 g is placed at a distance of 8 cm from the centre . Calculate centrifugal force on the coin . Take `pi^(2) = 9. 87` .

A

`4000"dyne"`

B

`600 "dyne"`

C

`5685.12"dyne"`

D

`3124.20"dyne"`

Text Solution

Verified by Experts

The correct Answer is:
C
Since, angular velocity, `omega=60xx(2pi)/(60)=2pi" rad s"^(-1)`.
`therefore" Centrifugal froce", F=momega^(2)r=18xx(2pi)^(2)xx8`
`=18xx4xx(3.14)^(2)xx8`
`rArr" "F=5685.12"dyne"`
`~~0.06N`
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