Question

A 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

• A. $493cm/s^2$
• B. $720cm/s^2$
• C. $720cm/s^2$
• D. $990cm/s^2$

Answer 1

The correct option is A

$493cm/s^2$

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