Fundamentally, momentum conservation is linked to invariance under space translations. See Noether's theorem. If you want to find a system that does not conserve momentum you should look for situations where space is not uniform, e.g. balls rolling on the surface of a bowl, a planetary system (when the dynamics of the sun is neglected), etc.
Socorro is a city in Socorro County in the U.S. state of New Mexico. It is in the Rio Grande Valley at an elevation of 4,579 feet (1,396 m). In 2012 the population was 8,906.
16.6%. According to our research of Texas and other state lists there were 9 registered sex offenders living in Socorro, Texas as of March 28, 2017. The ratio of number of residents in Socorro to the number of sex offenders is 3,633 to 1. The number of registered sex offenders compared to the number of residents in this city is a lot smaller than the state average. Nearest city with pop. 50,000+: El Paso, TX (13.5 miles , pop. 563,662).