Question

The angular velocity of rotation of hour hand of a watch is how many times the angular velocity of Earth's rotation about its own axis?

• A. Three
• B. Four
• C. Two
• D. Six

Answer 1

Answer: (C)

Two

Answer is C.

Hour hand completes one rotation in 12 hours while Earth completes one rotation in 24 hours. So, angular velocity of hour hand is double the angular velocity of Earth.
Angular velocity $\omega =\frac{2\pi }{T}$.
Hence, the angular velocity of rotation of hour hand of a watch is two times the angular velocity of Earth's rotation about its own axis.