The variable is what changes during an experiment. Hopefully this helped! :)
Alcohol djjskanfjsns d is
E = mc^2
E = 8.90 * 10^12 Joules
c = 3 * 10^8 m/s
m = ????
8.90 * 10^12 = m * (3 * 10^8)^2
8.90 * 10^12 = m * 9 * 10^16
9.889 * 10^-4 kg = m <<<<< answer
They will attract each other when brought close but when they touch the glass rod will become a negative charge and will repel each other
