Why can energy move through outer space by radiation, but not by convection or conduction

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

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.

Which statements did both aristotle and ptolemy assume? check all that apply.