Water molecules are made of slightly positively charged hydrogen atoms and slightly negatively charged oxygen atoms. Which force keeps water molecules stuck to one another?
A strong nuclear
B gravitational
C weak nuclear
D electromagnetic

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?

If you let go of the notebook after lifting it, will it move? how?

First answer marked as brainiest which is the correct equation describing the first law of thermodynamics? a) when the internal energy of a system changes, it equals the amount of heat added plus the work done. b) when work is done by the piston, it is equal to the heat added plus the change in internal energy of the system. c) when heat is added to the system, it is equal to the amount of work done by the piston plus the change in internal energy of the system.