Question

The length of hour hand of a wrist watch is $1.5cm$. Find magnitude of tangential acceleration?

• A. $1rad/s^2$
• B. $0rad/s^2$
• C. $2\pi rad/s^2$
• D. $\pi rad/s^2$

Answer 1

Answer: (B)

$0rad/s^2$

The length of hour hand of a wrist watch is $1.5$cm , $r=1.5$cm $=0.015$m

In case of uniform, circular motion, centripetal or angular acceleration $=0$.

we know, tangential acceleration $=$ radius of circular path $\times$ angular acceleration

$=0.015\times 0=0$

Hence, tangential acceleration $=0$