This works best using a tap outside which is raised off the ground a height unless you have a deep sink. you can also use a hose raised above the ground (without a nozzle). turn on the water so that the water is running smoothly (turned on a small amount). 1. describe what you see with respect to the diameter of the water near the tap and near the ground/sink surface. 2. explain in terms of continuity theorem and bernoulli's equation what is happening.

Certain bacteria (such as aquaspirillum magnetotacticum) tend to swim toward the earth’s geographic north pole because they contain tiny particles, called magnetosomes, that are sensitive to a magnetic field. if a transmission line carrying 100 a is laid underwater, at what range of distances would the magnetic field from this line be great enough to interfere with the migration of these bacteria? (assume that a field less than 5% of the earth’s field would have little effect on the bacteria. take the earth’s field to be 5.0 * 10-5 t, and ignore the effects of the seawater.)