Humans first traveled to the Moon in a spacecraft in 1969. What happened as the spacecraft traveled farther from Earth?
A)The force of gravity from Earth acting on the spacecraft increased because the mass of the spacecraft decreased.

B)The force of gravity from Earth pulled on the spacecraft the same amount because it stayed in the Solar System.

C)The force of gravity from Earth acting on the spacecraft decreased because the distance from Earth increased.

D)The force of gravity from Earth stopped pulling on the spacecraft because there is no gravity in outer space.

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.)