Stone is tied to one end of a string 50, cm long is whirled in a horizontal circle with a constant s

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3-2.Motion in Plane

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stone is tied to one end of a string $50\, cm$ long is whirled in a horizontal circle with a constant speed. If the stone makes $10$ revolutions in $20\, s$, what is the magnitude of acceleration of the stone ......... $cm/s^2$

A$493$

B$720$

C$860$

D$990$

Solution

(a)$a = 4{\pi ^2}{n^2}r = 4{\pi ^2}{\left( {\frac{1}{2}} \right)^2} \times 50 = 493\,cm/{s^2}$

Standard 11

Physics

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