Park attendees often enjoy sitting in the Spring Rocket and swaying back and forth. When the rocket is pushed forward, the rocket pushes the spring to the
left. Which of the following statements best describes the other force in this
action - reaction force pair?
A. The spring pushes the rocket to the left.
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B. The spring pulls the rocket to the right.
C. The spring pulls the rocket down.
D. The spring pushes the rocket up.

An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?