The variables for this experiment include mass, volume, and the materials in the various balls, as well as their densities. in part i, you will be comparing a table tennis ball and a golf ball. use the drop-down menus to complete the sentences and identify the independent and dependent variables. in part i, the independent variable, the one that is intentionally manipulated, is . in part i, the dependent variable, the one that you measure the response in, is .

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