A10kg cement block horizontally at 6 m/s plows into a bank of sand and comes to a stop in 2.0 m/s. what is the average impact force on the bank?

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

Should we celebrate the voyages of zheng he mini q answer key

During the past 150 years in the united states, how did energy consumption compare to population growth