6. Which of these statements is true with respect to Newton's 2nd Law? a. Acceleration is inversely proportional to net force.
b. Acceleration is directly proportional to mass.
c. The three variables in Newton's 2nd Law are net force, velocity, and mass.
d. If the force is constant and the mass increases, the acceleration decreases.
e. If the force is constant and the mass increases

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?