Answer the question from the given passage. Your answer should be directly extracted from the passage, and it should be a single entity, name, or number, not a sentence.

Input: Consider Input: Passage: Luther's hymns were frequently evoked by particular events in his life and the unfolding Reformation. This behavior started with his learning of the execution of Johann Esch and Heinrich Voes, the first individuals to be martyred by the Roman Catholic Church for Lutheran views, prompting Luther to write the hymn 'Ein neues Lied wir heben an' ('A new song we raise'), which is generally known in English by John C. Messenger's translation by the title and first line 'Flung to the Heedless Winds' and sung to the tune Ibstone composed in 1875 by Maria C. Tiddeman. Question: What caused Luther to write hymns?

Output: events in his life


Input: Consider Input: Passage: A steam turbine consists of one or more rotors (rotating discs) mounted on a drive shaft, alternating with a series of stators (static discs) fixed to the turbine casing. The rotors have a propeller-like arrangement of blades at the outer edge. Steam acts upon these blades, producing rotary motion. The stator consists of a similar, but fixed, series of blades that serve to redirect the steam flow onto the next rotor stage. A steam turbine often exhausts into a surface condenser that provides a vacuum. The stages of a steam turbine are typically arranged to extract the maximum potential work from a specific velocity and pressure of steam, giving rise to a series of variably sized high- and low-pressure stages. Turbines are only efficient if they rotate at relatively high speed, therefore they are usually connected to reduction gearing to drive lower speed applications, such as a ship's propeller. In the vast majority of large electric generating stations, turbines are directly connected to generators with no reduction gearing. Typical speeds are 3600 revolutions per minute (RPM) in the USA with 60 Hertz power, 3000 RPM in Europe and other countries with 50 Hertz electric power systems. In nuclear power applications the turbines typically run at half these speeds, 1800 RPM and 1500 RPM. A turbine rotor is also only capable of providing power when rotating in one direction. Therefore, a reversing stage or gearbox is usually required where power is required in the opposite direction.[citation needed] Question: In the United States, what is a usual turbine speed with 60 Hertz of power?

Output: 3600 revolutions per minute


Input: Consider Input: Passage: The programme's first serial, An Unearthly Child, shows that the Doctor has a granddaughter, Susan Foreman. In the 1967 serial, Tomb of the Cybermen, when Victoria Waterfield doubts the Doctor can remember his family because of, 'being so ancient', the Doctor says that he can when he really wants to—'The rest of the time they sleep in my mind'. The 2005 series reveals that the Ninth Doctor thought he was the last surviving Time Lord, and that his home planet had been destroyed; in 'The Empty Child' (2005), Dr. Constantine states that, 'Before the war even began, I was a father and a grandfather. Now I am neither.' The Doctor remarks in response, 'Yeah, I know the feeling.' In 'Smith and Jones' (2007), when asked if he had a brother, he replied, 'No, not any more.' In both 'Fear Her' (2006) and 'The Doctor's Daughter' (2008), he states that he had, in the past, been a father. Question: What is the name of the first Doctor Who serial?
Output: An Unearthly Child