Conservation law, also called law of conservation, in physics, several principles that state that certain physical properties (i.e., measurable quantities) do not change in the course of time within an isolated physical system. In classical physics, laws of this type govern energy, momentum, angular momentum, mass, and electric charge.
On New Yearâs Eve, the Metrorail system will open at 7 a.m. with special extended service on all lines until 3 a.m. The additional three hours of service â consistent with past years â is a special exception to a moratorium on extended hours during the year-long SafeTrack maintenance program.
Liquor stores can only open from 8 a.m. until 10 p.m., Monday through Saturday. Some cities restrict liquor store opening hours further-Minneapolis liquor stores may open these hours, but St. Paul liquor stores close at 8 p.m. Monday through Thursday, and are open until 10 p.m. on Friday and Saturday.