When you jump, you push the earth downward. Why can’t you tell that the earth has moved?

Phase changes are chemical changes. true or false

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.