Marc Attaches a Falling 400-Kg Object with a Rope Through

Marc attaches a falling 400-kg object with a rope through a pulley to a paddle wheel shaft.He places the system in a well-insulated tank holding 30 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 120 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⋅°C,and g = 9.8 m/s²)

A) 8,140 C°
B) 3,700 C°
C) 3.7 C°
D) 0.6 C°
E) ​22.2 C°

Correct Answer:

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