You are a fitness trainer developing an exercise that involves pulling a heavy crate across a rough surface. You attach a rope to a crate of mass =45.0 kg and place it on a carpeted track. The coefficient of kinetic friction between the crate and the carpet is k=0.430. To test the apparatus, you have one of your employees pull on the rope as hard as she can.
If she pulls with a force of 295 N along the direction of the rope while the rope makes an angle of 29.0∘ with the floor, as shown in the figure, what is the acceleration of the box?

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.