In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

[Q]: This quantity for an atomic nucleus is determined using Weizscker's [VAHYTS-zek-uhrs] formula. The no hair theorem states black holes are completely characterized by their angular momentum, charge, and this quantity. The oscillation period of a spring equals two pi times the square root of this quantity over the spring constant. The theoretical value of this quantity for gluons is zero. Linear momentum equals this quantity times velocity. For 10 points, name this quantity measured in kilograms.
[A]: Science


[Q]: The vocal part in the sixth movement is given with the instruction "without regard for the tempo," and that movement is labeled "Farewell. " Its first section contains the repeated line "Dark is life, is death," and features a tenor singing in his upper ranges. Movements of this piece include "Of Youth," "Of Beauty," and "The Lonely Soul in Autumn," while its first takes its name from the drunken poems of a certain poet. FTP, name this work that contains the movement "The Drinking Song of Earth's Miser," a song cycle by Gustav Mahler partly based on the poetry of Li Po.
[A]: Fine Arts


[Q]: This leader defeated General Arnegisclus (ar-neh-GISS-kluss) at the Battle of the Utus shortly before destroying the city of Marcianopolis. He withdrew after the Battle of the Catalaunian Plains against armies under the command of Flavius Aetius (FLAY-vee-us AY-tee-us) and Theodoric (THEE-oh-DOR-ick) I of the Visigoths. This man shared power with his brother Bleda (BLAY-duh) until Bleda's death around 445. For 10 points, identify this man nicknamed the Scourge of God, leader of the Huns.
[A]:
Social Science