posted by ahnas on .
A pendulum is 18 feet long. Its central angle is 44º. The pendulum makes one back and forth swing every 12 seconds. Each minute, the pendulum swings _____ feet. (Answer to the nearest foot.)
s = rθ = 18(44*pi/180) = 13.82ft in one arc
It makes 10 (5 back and forth) swings every minute.
Total travel: 138 ft
s=rØ r=18 Ø= (11π/45) radians
The pendulum travels 138 feet each minute
Degrees to radians;
(44÷1) × (π÷180) = (11π÷45)