Sally says that divergent plates cause the greatest, strongest Earthquakes. Marks says she's wrong. Tell me who is correct, and how do you know? * i will give 16 points for help plz help

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

When an object is heated it contracts. a. true b. false

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