Which statement supports Newton’s first law of motion?
A. Planets can change the direction of their own orbital path.
B. Planets with more inertia will not be impacted by the Sun’s gravity.
C. Planets can move at a varying speed due to forces exerted in space.
D. Planets with a greater mass will orbit more quickly than smaller planets.

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.)