A spaceship has a mass of 9000 kg. The spaceship is launched from Earth and lands on a distant planet where it has a weight of 390,000 N. What is the acceleration of gravity on this planet? Round to the nearest tenth (one place after the decimal).

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.)