Marc Attaches a Falling 250-Kg Object with a Rope Through $\degree$

question 100

Multiple Choice

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 · $\degree$ C, and g = 9.8 m/s²)

• A) 19,600\(\degree\)C
• B) 4700\(\degree\)C
• C) 4.9\(\degree\)C
• D) 2.3\(\degree\)C

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