An insulated container, filled with 10 kg of liquid water at 20° C, is fitted with a stirrer. The stirrer is made to turn by lowering a 25-kg object outside the container a distance of 10m using a frictionless pulley system. The local acceleration of gravity is 9.7 m/s². Assume that all work done by the object is transferred to the water and that the water is incompressible.

A. Determine the work transfer (kJ) to the water.

B. Determine the increase in internal energy (kJ) of the water.

C. Determine the final temperature (°C) of the water. a good approximation.

D. Determine the heat transfer (kJ) from the water required to return the water to its initial temperature.