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I have some physics homework and I'm not looking for the answers. Rather, the textbook I currently use does not seem to be doing a good job (in my opinion) in explaining the topics. If anyone has seen some of these questions before and know what textbook they are used in, please let me know so by reading that one I may be able to understand the topics a little better (with respect to the problems). I have the answers as the solutions are available, but without any explanation. Here are some of the assigned homework problems:

Water is flowing at a speed of 0.5m/s through a 4cm diameter hose. The hose is horizontal. What is the mass flow rate of the water? At what speed does the water pass through a nozzle whose effective diameter is 0.6cm? what must be the absolute pressure of the water entering the hose if the pressure at the nozzle is atmospheric pressure

Water flows at a rate of 30mL/s through an opening at the bottom of a large tank in which the water is 4m deep. Calculate the rate of escape of the water if an added pressure of 50kPa is applied to the top of the water.

Water is moving with a speed of 8m/s through a pipe of 4cm in diameter. The water gradually descends 15m as the pipe diameter increases to 6cm. what is the speed of the flow at the lower level? If the pressure at the upper level is 200,000 Pa, what is the pressure at the lower level?

Thanks for any help.