Aboxcar of length 9.9 m and height 2.4 m is at rest on frictionless rails. inside the boxcar (whose mass when empty is 3300 m) a tank containing 2100 m of water is located at the left end. the tank is 0.9 m long and 2.4 m tall. at some point the walls of the tank start to leak, and the water fills the floor of the boxcar uniformly. assume that all the water stays in the boxcar.

after all the water has leaked out what will be the final velocity of the boxcar?

what is the displacement of the boxcar 6 s after the water has settled in the bottom. (take positive displacement as being to the right.)

The field between two charged parallel plates is kept constant. if the two plates are brought closer together, the potential difference between the two plates either a) decrease b) does not change c) increase?

Which composition of water moves to begin a deepwater current?

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