Adog named rascal leaves his home and travels a short distance and then returns home. the graph shows his position as a function of time.
how does his velocity on his return trip compare to his velocity for the first 5 seconds?
a) his velocity was slower when compared to the first 5 seconds.
b) his velocity was positive on the return trip when compared to the first 5 seconds.
c) his velocity on the return trip was twice as slow when compared to the first 5 seconds.
d) his velocity on the return trip was twice as fast when compared to the first 5 seconds.

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