Question

The tip of the seconds hand of a clock takes $60$ seconds to move once on the circular dial of the clock. If the radius of the dial of the clock be $10.5\text{cm}$ then calculate the speed of the tip of the seconds hand.

• A. $1.1\text{m/s}$
• B. $2.2\text{m/s}$
• C. $0.011\text{m/s}$
• D. $0.11\text{m/s}$

Answer 1

The correct option is C $0.011\text{m/s}$

We know that,

$\text{Speed}=\frac{\text{Total distance}}{\text{Total time}}$

$\Rightarrow v=\frac{2\pi r}{t}=\frac{2\times \frac{22}{7}\times 10.5}{60}=1.1\text{cm/s}=0.011\text{m/s}$

Hence, option $\left(C\right)$ is the correct answer.