Aball is dropped from the top of a building. when does the ball have the least kinetic energy? (a) after it has hit the ground (b) just before it hits the ground (c) just after it is released (d) half way through the fall

How does an observation about an object differ from an inference about that object

If you put a helium-filled balloon in the refrigerator, what will happen?

An insulated thermos contains 148 g of water at 72.7 ˚c. you put in a 11.7 g ice cube at 0.00 ˚c to form a system of ice + original water. the specific heat of liquid water is 4190 j/kg•k; and the heat of fusion of water is 333 kj/kg. what is the net entropy change of the system from then until the system reaches the final (equilibrium) temperature?