EXAMPLE 4-21 The skier. The skier in Fig. 4-34a has begun descending the 30° slope. If the coefficient of kinetic friction is 0.10, what is her acceleration? NN Motion Fo=mg FIGURE 4-33 Forces on an object sliding down an incline.

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?