Which of the following processes can in theory take place (almost) reversibly? A: A burning candle B: A refrigerator that works normally C: A fish swimming in the water D: The sun shining on the earth

When a glass tube with a very small inner diameter is placed vertically with the lower opening down in a cup of water, one can observe that the water rises higher inside the pipe than on the outside. Which of the following parameters has no direct effect on how high the water can rise? A: The inner diameter of the pipe B: Viscosity of the water C: The surface tension of the water

A stone with a large mass and a stone with a small mass are released from a height of 10 meters. Which stone has the greatest amount of movement when they reach the ground? You can ignore the air resistance. A: The little one B: The big one C: They have the same amount of movement D: It's impossible to know

can someone explain why ??