On a hot summer day, you decide to make some iced tea. first, you brew 1.50 l of hot tea and leave it to steep until it has reached a temperature of ttea = 75.0 ∘c. you then add 0.975 kg of ice taken from the freezer at a temperature of tice = 0 ∘c. by the time the mix reaches equilibrium, all of the ice has melted. what are the interacting systems in this problem?

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano.the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? positive force → balanced force → negative force negative force → balanced force → positive force positive force → unbalanced force → negative force negative force → unbalanced force → positive force