A 1.00 -kg gold bar is taken from a forge at 800 degrees * C and dropped into 4.00 kg of water at 10.0 °C . Assuming that no energy is lost by heat to the surroundings , determine the total entropy change of the bar-plus- water system.

At the Olympic games, a 73.2 kg diver performs an inward straight dive in which she stands on the 10.0 m platform with her back to the water, then rotates in the forward direction and plunges 10.0 m downward into the 28.0°C pool, briefly coming to a stop. (a) What is the entropy change of the system of the diver and the swimming pool for the time interval beginning when the diver leaves the platform and ending when the diver has come to a stop? (Give your answer in J/K.) J/K (b) The diver remains in the pool after her dive to watch the remainder of the Olympic event, and her core temperature slowly drops from 37.0°C to 36.0°C. Assuming that the temperature of the swimming pool remains unchanged at 28.0°C and that the diver does no work and does not metabolize any food during this interval, what is the change in entropy of the system of the diver and the swimming pool after her core temperature has reached 36.0°C? (Give your answer in J/K. Assume the specific heat of the diver is equal…

A 2.8 kg piece of aluminum at 43.0 degrees C is placed in 1.0 kg of water in a Styrofoam container at room temperature (20 degrees C). Estimate the net change in entropy of the system.

Consider a 50.0 g ice cube placed in a container containing 200 g of water. The water is initially at 25.0*C and the ice cube comes directly from a freezer at -15.0*C. Assume no heat is lost to the surroundings and negligible heat loss from the container. Determine the total change in entropy as a result of the mixing process.