Hiro walks up a flight of stairs in his apartment building. later in the day, he runs up the same flight of stairs.

which statement about work and power describes hiro’s actions?

he did more work running than walking.
he did more work walking than running.
he had more power running than walking.
he had more power walking than running.

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.)