Physics
posted by Jack .
The Earth's rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2006 the Earth took about .840 s longer to complete 365 revolutions than it did in the year 1906. What was the average acceleration of the Earth during this time? Give your answer in rad/s^2

Average angular accleration =
(change in angular velocity)/(100 years)
Angular velocity = 2 pi radians/24 hours
= 7.276*10^5
relative change in angular velocity =
(0.840 s/86400 s) = 9.72*10^6
absolute change in angular velocity
7.07*10^10 rad/s
Now go back to the first formula, and divide by the number of seconds in 100 years.