You are on in-line skates at the top of a small hill. Your potential energy is equal to 1,250 J. The last time you checked, your mass was 65.0 kg. If you start rolling down this hill, your potential energy will be converted to kinetic energy. When you are 1.5 m from the bottom of the hill, how fast are you going? *

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.)