Kepler's third law states that the planet's orbital period squared is equal to its mean solar distance cubed. consequently, the solar distances of the planets can be calculated when their periods of revolution are known. the orbital period of jupiter is 12 years, what is its distance from the sun in astronomical units?

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.)