Which model shows 4 electrons in the outer shell of the atom? A. 1
B. 3
C. 2
D. 4

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?

What happens when a rubber rod is rubbed with a piece of fur?

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