Question 4 of 10 A spacecraft has a momentum of 20,000 kg. m/s up, and a mass of 500 kg.
What is its velocity?
A. 400 m/s
B. 1000 m/s
C. 10,000,000 m/s
D. 40 m/s

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.)