Asmall block of mass m is released from rest at point a at the top of a frictionless quarter-circular slide of radius r. it slides down to point b and across a rough horizontal surface. after sliding a distance l to point c, the block encounters a spring of spring constant k, and compresses it a distance d before coming to rest at point p. the surface is rough all the way from point b to point p. derive an expression for the coefficient of kinetic friction between the floor and the block, in terms of relevant system parameters.

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s. part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.