A ferry with a velocity of 6.55 m/s travels from one side of a 945 m wide river to the other side at a point directly across. When a current is flowing down the river, the ferry's captain directs the
boat at an angle up river so that the ferry arrives at the correct landing point. If the speed of the
river water is 4.7 m/s, how long does the trip take?

Suppose water is leaking from a tank through a circular hole of area ah at its bottom. when water leaks through a hole, friction and contraction of the stream near the hole reduce the volume of water leaving the tank per second to cah 2gh , where c (0 < c < 1) is an empirical constant. a tank in the form of a right-circular cone standing on end, vertex down, is leaking water through a circular hole in its bottom. (assume the removed apex of the cone is of negligible height and volume.) (a) suppose the tank is 20 feet high and has radius 8 feet and the circular hole has radius 2 inches. the differential equation governing the height h in feet of water leaking from a tank after t seconds is dh dt = − 5 6h3/2 . if the height of the water is initially 8 feet, how long will it take the tank to empty? (round your answer to two decimal places.)

What is the rate of 12 liters of water moving through a water hose in 4.0 minutes?

What sort of waves exhibit the doppler effect?