The end of the tracks, 8.8 m lower vertically, is a horizontally situated spring with constant 5 × 105 n/m. the acceleration of gravity is 9.8 m/s 2 . ignore friction. how much is the spring compressed in stopping the ore car? answer in units of m.

In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.

The energy produced as a result of this flow of electrons from atom to atom is called

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