The Metonic cycle is the
A) 18-year, 11-day period over which the pattern of eclipses repeats.
B) period between successive Easters.
C) 12-month period of a lunar calendar.
D) 19-year period over which the lunar phases occur on about the same dates.
E) 29 1/2-day period of the lunar cycle.
D
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Marc attaches a falling 250-kg object with a rope through a pulley to a paddle wheel shaft. He places the system in a well-insulated tank holding 12 kg of water. When the object falls, it causes the paddle wheel to rotate and churn the water. If the object falls a vertical distance of 100 m at constant speed, what is the temperature change of the water? (1 kcal = 4186 J, the specific heat of
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