losed thermodynamic system consists of a stone with a mass of 5 kg and a bucket containing 10 m3 of water. The entire system is at the same temperature with the surroundings. The stone is initially at rest 25 m above the water. The stone falls into the water. No water is lost from the bucket. What is the change in

a. Internal energy of the system

b. Work done by the system

c. Heat loss by the syste