An unbalanced force of 10 N acts on a 20 kg mass for 5 seconds. What is the acceleration? a. 0.5 m/s2
d. 200 m/s2
b. 40 m/s2
e. 2.5 m/s2
C. 2 m/s2

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.)