Problem: Since such mass (kinetic energies of particles, the energy of trapped electromagnetic radiation and stored potential energy of repulsive fields) is measured as part of the mass of ordinary matter in complex systems, the "matter" status of "massless particles" and fields of force becomes unclear in such systems. These problems contribute to the lack of a rigorous definition of matter in science, although mass is easier to define as the total stress–energy above (this is also what is weighed on a scale, and what is the source of gravity).[citation needed]
Mass is harder to define as being what?
---
Answer: unanswerable


Problem: The school's sports teams, wearing crimson and royal blue, are called the Kansas Jayhawks. They participate in the NCAA's Division I and in the Big 12 Conference. KU has won thirteen National Championships: five in men's basketball (two Helms Foundation championships and three NCAA championships), three in men's indoor track and field, three in men's outdoor track and field, one in men's cross country and one in women's outdoor track and field. The home course for KU Cross Country is Rim Rock Farm. Their most recent championship came on June 8, 2013 when the KU women's track and field team won the NCAA outdoor in Eugene, Oregon becoming the first University of Kansas women's team to win a national title.
Where does KU's cross country team swim?
---
Answer: unanswerable


Problem: Public schools are part of the Ann Arbor Public Schools (AAPS) district. AAPS has one of the country's leading music programs. In September 2008, 16,539 students had been enrolled in the Ann Arbor Public Schools. There were 21 elementary schools, five middle schools (Forsythe, Slauson, Tappan, Scarlett, and Clague) three traditional high schools (Pioneer, Huron, and Skyline), and three alternative high schools (Community High, Stone School, and Roberto Clemente) in the district. The district also operates a K-8 open school program, Ann Arbor Open School, out of the former Mack School. This program is open to all families who live within the district. Ann Arbor Public Schools also operates a preschool and family center, with programs for at-risk infants and children before kindergarten. The district has a preschool center with both free and tuition-based programs for preschoolers in the district.
What kind of high school is Forsythe?
---
Answer:
unanswerable