Aspace shuttle was launched from the earth to the moon. the average, or accepted, value of the distance of the earth to the moon is 238,857 miles, but the shuttle crew recorded that their trip took 226,316 miles.
calculate the percent error of the distance to the moon.
5.25%
7.15%
3.75%
4.45%

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