Jenny and Betty are having a great time at Busch Gardens riding the Ubanga Banga bumper cars. Jenny, who is traveling southward in her bumper car, aims her car toward Betty, who is traveling northward in her bumper car. The cars collide and briefly come to a stop. What is the direction of the acceleration of Jenny's car during the collision?

James grows the bacteria in his lab and notices that when grown in a uniform medium rich in salts and amino acids, these bacteria swim along zig-zag paths at a constant speed of 20 μm/s. The figure shoes the trajectory of an E. Coli as it moves from point A to point E. Each segment of the motion can be identified by two letters, such as segment BC. a)  For each of the four segments in the bacterium’s trajectory, calculate the x- and y- components of its displacement and of its velocity. b)  Calculate both the total distance traveled and the magnitude of the net displacement for the entire motion. c)  What are the magnitude and the direction of the bacterium’s average velocity for the entire trip? (SHOW ALL WORK UNITS AND FORMULAS USED PLEASE)

A9

Sally is on a kayak that comes to a stop a small distance from the dock. Since it is such a small distance, Sally decides to jump to the dock. She makes the jump, but the kayak moves away from her as she jumps. Since Sally is interested to see what happens on other boats, she makes the same jump from a yacht that is much larger than the kayak. Which boat will move away from Sally more quickly? Both boats will move away at the same speed because Sally has not changed mass and momentum must be conserved. O The yacht will move away from Sally more quickly because it is larger in mass. O It is impossible to predict which boat moves away from Sally more quickly. O The kayak will move away from Sally more quickly because the yacht is larger in mass.