Which model below represents a box with balanced forces on the left and right?

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.

If the moon rises at a given location at 6: 00 p. m. today, about what time will it rise tomorrow night?

Me ! since green bounces off red, this must be collision a. elastic b. explosion c. inelastic