The mouth is also known as the oral cavity. its purpose is to mechanically break down food, moisten it with saliva, and swallow the food into the esophagus and eventually, the stomach. our teeth start the physical digestion process. because of the varied shapes of our teeth, they have different functions. which teeth are designed for crushing and grinding our food? a) canines b) incisors c) bicuspids and molars d) incisors and bicuspids

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