On a frictionless horizontal air table, puck a (with mass 0.254 kg ) is moving toward puck b (with mass 0.367 kg ), which is initially at rest. after the collision, puck a has velocity 0.123 m/s to the left, and puck b has velocity 0.651 m/s to the right.

what was the speed vai of puck a before the collision?

calculate δk, the change in the total kinetic energy of the system that occurs during the collision.

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.)