1. earth is located at one of the moon's orbit.2. according to kepler's second law, jupiter will be traveling most slowly around the sun when at .3. earth orbits in the shape of a/an around the sun.4. the mathematical form of kepler's third law measures the period in years and the in astronomical units (au).5. according to kepler's second law, pluto will be traveling fastest around the sun when at .6. the extent to which mars' orbit differs from a perfect circle is called its:

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?