At what time does the oscillator shown below first reach its Equilibrium Position?
А
B
t=0.0 st=0.30 s
С
D
t=0.45 s t=0.90 S
E
t=1.35 s
F
t=1.80 s
fum
+0.10 m
0
-0.10 m
(Unit = s)

In an old-fashioned amusement park ride, passengers stand inside a 3.0-m-tall, 5.0-m-diameter hollow steel cylinder with their backs against the wall. the cylinder begins to rotate about a vertical axis. then the floor on which the passengers are standing suddenly drops away! if all goes well, the passengers will “stick” to the wall and not slide. clothing has a static coefficient of friction against steel in the range 0.60 to 1.0 and a kinetic coefficient in the range 0.40 to 0.70. part a what is the minimum rotational frequency, in rpm, for which the ride is safe? express your answer using two significant figures. f f = rpm