Question

A table clock has its minute's hand 4 cm long. Find the average velocity of the tip of the minute hand between 6.00 am to 6.30 am.

• A. 0.04 cm/sec
• B. 0.004 cm/sec
• C. 0.0044 cm/sec
• D. None

Answer 1

Answer: (C)

0.0044 cm/sec

Length of minute hand $r=4cm$
In 30 minutes, the tip of minute hand reaches diametrically opposite end of the clock.
Thus displacement of tip of minute hand $d=2r=8cm$
Time taken $t=30min=30\times 60=1800s$
So, average velocity $v_{avg}=\frac{d}{t}=\frac{8cm}{1800}=0.0044cm/s$
Option C is correct.