. Example 2.8
PI: A hydraulic lift with piston of diameters D,- 5 cm and D,= 15 cm is shown in Figure :
: 2.10. If the weight of the block W = 1800 N, find the minimum force F to lift up the:
weight W

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.