KCET 2015 Physics Solved Paper

For second-hand, t=60s
So,angular speed ω=

2π

60

For hour-hand, t = 12 hour =12×60×60s
So, angular speed,ω′=

2π

12×60×60

Then ratioTherefore, ratio of angular speed of a second-hand to the hour-hand of a watch is 720 : 1