An ion of iron has an 26 protons, 30 neutrons, and 23 electrons. What are its atomic number, atomic mass, and net charge? 1 A. atomic number = 26, atomic mass = 56, net charge = 3+
2 B. atomic number = 26, atomic mass = 56, net charge = 3-
3 C. atomic number = 30, atomic mass = 56, net charge = 3+
4 D. atomic number = 56, atomic mass = 26, net charge = 3-

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?