Boat travels through a river at a speed of 25 m/s, passing through schools and opening the soundtrack. One student measures frequency 610 Hz. Four seconds later, student measures frequency again 587 Hz if the river is a straight line 20 m wide and the speed of sound in air is 340m/s if boat is middle river. find the distance between boat with school?

Adiver named jacques observes a bubble of air rising from the bottom of a lake (where the absolute pressure is 3.50 atm) to the surface (where the pressure is 1.00 atm). the temperature at the bottom is 4.00 ∘c, and the temperature at the surface is 23.0 ∘c.what is the ratio of the volume of the bubble as it reaches the surface (vs) to its volume at the bottom (vb)? if jaques were to hold his breath the air in his lungs would be kept at a constant temperature. would it be safe for jacques to hold his breath while ascending from the bottom of the lake to the surface?