Marc Attaches a Falling 250-Kg Object with a Rope Through

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 · °C,and g = 9.8 m/s²)

A) 19,600°C
B) 4700°C
C) 4.9°C
D) 2.3°C