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

water is 4186 J/kg • °C, and g = 9.8 m/s2)
a. 19,600°C
c. 4.9°C
b. 4700°C
d. 2.3°C


C

Physics & Space Science

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