*Imagine that you are exploring a newly discovered planet with atmospheric conditions
similar to Earth's, a) Summarize the environment at the planet's surface, including at
least one type of matter that exists in each of the four physical states. b) Explain why-
each sample is considered to exist in each state you have described, including
information about the properties you observe.

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