The picture above shows 3 sets of balloons, all with a particular charge. which of the picture(s) is true? explain. then explain why the other 2 pictures are incorrect. make sure to explain all 3 sets.

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?

What are atoms of the same element with varying number of neutrons

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.