A0.080kg robin, perched on a power line 6 m above the ground , swoops down to snatch a worm from the ground and then returns to an 8 m high tree beach with his catch. by how much did the birds pe increase in his trip from the power line to the branch?

In what direction does the medium move relative to the direction of the wave? explain.

Velocity is a description of both speed and direction, therefore it - a vector - a force arrow - the same as acceleration - a magnitude

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.