Question

Calculate the speed of the tip of a minute hand of lenghth 4cm in completing one round

Answer 1

distance travelled by the tip of the minute hand is 2πr where r is 4cm. that is
$d = \frac{2 \times 22 \times 4}{7} = \frac{176}{7}cm = \frac{176}{700} m \\ time \: t = 60 \: minutes = 3600s \\ speed = \frac{d}{t} = \frac{176}{700 \times 3600} \\ = 6.98 \times {10}^{ - 5} m {s}^{ - 1}$