Joe and his dad build a campfire out of 5 kilograms of wood. After the fire, there is a 1-kilogram log remaining. According to the law of conservation of mass, what is the mass of the ash and gases that resulted from the fire?

Aprotein molecule in an electrophoresis gel has a negative charge. the exact charge depends on the ph of the solution, but 30 excess electrons is typical. what is the magnitude of the electric force on a protein with this charge in a 1600n/c electric field? write in two significant numbers, and also in newton