A 12-foot fence on the property line casts a 20-foot shadow on the shortest day of the year, and the north side of the house is set back 30 feet from the property line. Find the maximum height the house can be built.

In a system, when potential energy decreases, then entropy also decreases. true false

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost

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?