Which of the following describes the work done by a heat engine? O A. Qin + Dout
B. Qin - Qout
c. Qin - W
D. Qout - Qin

The movement of electrons between atoms is called an

Directions: count the number of atoms. ar co2 na3po4 so3 nac2h3o2

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