The mass of block A is 4 kg, the mass of block B is 3 kg, and the angle of the ramp is θ = 30°. The rope moves over the pulley without slipping. The coefficient of kinetic friction between the block A and the ramp is 0.15. The pulley can be modeled as a uniformly dense cylinder with a mass of 4 kg and a radius of 10 cm. What is the magnitude of the tension (in N) in the rope between block B and the pulley?

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.