Marc Attaches a Falling 500-Kg Object with a Rope Through $\degree$

question 37

Multiple Choice

Marc attaches a falling 500-kg object with a rope through a pulley to a paddle wheel shaft.He places the system in a well-insulated tank holding 25 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 = 4 186 J,the specific heat of water is 4 186 J/kg* $\degree$ C,and g = 9.8 m/s²)

• A)19 600 C \(\degree\)
• B)4 700 C \(\degree\)
• C)4.7 C \(\degree\)
• D)0.8 C \(\degree\)

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