physics
posted by maria .
A large water tank has an inlet pipe and an outlet pipe. The inlet pipe has a diameter of 2.19 cm and is 1.25 m above the bottom of the tank. The outlet pipe has a diameter of 5.93 cm and is 4.85 m above the bottom of the tank. A volume of 0.411 m^3 of water enters the tank every minute at a gauge pressure of 1 atm.
a) What is the velocity of the water in the outlet pipe?
b) What is the gauge pressure in the outlet pipe?

It seems that water is being pumped into an opening near the bottom of the tank and being removed from an outlet higher above. Is this supposed to be a steady state situation?
If so,
(a) V*(outlet pipe area)= (volume flow rate at inlet)
(b) The guage pressure difference is (rho)*g*h
where h is the difference of heights of inlet and outlet 
A bat flying toward a wall at a speed of 6.47 m/s emits an ultrasound wave with a frequency of 27.5 kHz. What frequency does the reflected wave have when it reaches the flying bat? (Assume that the speed of sound is v = 341 m/s.)
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