The 1.23kg physics book shown is connected by a string to a 505.0g coffee cup. The book is given a push up the slope (call this direction positive) and released with a speed of 2.21m/s. The coefficients of friction are μs = 0.450 and μk = 0.221. a) What is the acceleration of the book if the slope is inclined at 30.0°?

b) How far does the book slide before it has zero speed?

Which is an example of an exothermic process?

Which type of energy would have nothing to do with ironing clothes? a. heat b. chemical c. electrical d. mechanical

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