A ball is thrown horizontally from the top of a 66 m building and lands 90 m from
the base of the building. Ignore air
resistance
a) How long is the ball in the air?
s
b) What must have been the initial
horizontal component of the velocity?
2
m/s
c) What is the vertical component of the
velocity just before the ball hits the
ground?
m/s
d) What is the velocity and angle of the
ball just before it hits the ground?
m/s
Degrees below x-axis

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.