For example in case of explosion of a particle into many fragments momentum is conserved in the x direction but not in the y direction where gravity is acting but if we consider the particle and Earth as a system the gravity force becomes an internal force and hence momentum is conserved for that system.
Compared to the rest of the country, Soldotna's cost of living is 26.90% Higher than the U.S. average. As of 2014, Soldotna's population is 4,209 people. Since 2000, it has had a population growth of 11.91 percent. Average Commute time is 15 minutes.
The 2016 Unalakleet, Alaska, population is 708. There are 195 people per square mile (population density). The median age is 38.4. The US median is 37.4. 45.23% of people in Unalakleet, Alaska, are married. 14.21% are divorced.