The speed of a car which has a constant acceleration of -2m/s2 decreases from 50km/h to 30km/h. The distance travelled needed to decreases the speed of the car is:
A. 30.7m B. 160m C. 48.2m D. 142m

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How much energy is supplied to each coulomb of charge that flows through a 12-v battery?

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