Adart is loaded into a spring-loaded toy dart gun by pushing the spring in by a 
distance d. for the next loading? the spring is compressed a distance d/3. how much 
work is required to load the second dart compared to that required to load the first? a) nine times as muchb) three times as muchc) the samed) one-third as muche) one-ninth as much

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