Amoving sound source a has a velocity (85 km/hr) \widehat{i\ } and a moving reflecting surface b has a velocity (75 km/hr) (-\ \widehat{i\ }). the source a emits a sound with a frequency of 39 khz. a) assuming b is approaching a find the frequency as heard by b b) assuming b is moving away from a, find the frequency as heard by b c) what is the frequency of the reflected beam to the source (pick (b) as the set-up to answer this question). speed of sound in air 340 m/s

Suppose that two tanks, 1 and 2, each with a large opening at the top, contain different liquids. a small hole is made in the side of each tank at the same depth 1.57 m below the liquid surface, but the hole in tank 2 has 2.49 times the cross-sectional area of the hole in tank 1. (a) what is the ratio ρ1/ρ2 of the densities of the liquids if the mass flow rate is the same for the two holes? (b) what is the ratio rv1/rv2 of the volume flow rates from the two tanks? (c) at one instant, the liquid in tank 1 is 14.9 cm above the hole. if the tanks are to have equal volume flow rates, what height above the hole must the liquid in tank 2 be just then?

Which process is represented by the pv diagram? a. the isobaric process b. the isovolumetric process c. the isothermal process d. the adiabatic process

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?