4 02
A scientist cooled the air inside a container.
02
1
The temperature of the air changed from 20 °C to 0 °C
The volume of the container of air stayed the same.
Explain how the motion of the air molecules caused the pressure in the container to
change as the temperature decreased.
[3 marks]

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