Comparison of electric & gravity forces: Two identicalblocks are placed 5 m apart. Each has a mass of 2 kg, iselectrically neutral, and is made entirely of copper. Note: Onecopper atom has a mass of 1.055·10-25 kg and contains 29 protons.a.) How many electrons must a neutral copper atom have? 29 Correct:Your answer is correct. electrons b.) Estimate the percentage of acopper atom's mass that is due to: electrons: 0.025 Correct: Youranswer is correct. % protons: 45.9 Correct: Your answer is correct.% Do a proton & electron have an equal amount of charge? Ofmass? Also, what constitutes the remaining mass of these copperatoms? c.) Estimate how many electrons each of these blocks haswithin it. 5.50e26 Correct: Your answer is correct. electrons Whatis the total charge of all these electrons? -8.8e7 Correct: Youranswer is correct. C And what is the total charge of all theprotons in a block? +8.8e7 Correct: Your answer is correct. C Sowhat is the net charge of each block? 0 Correct: Your answer iscorrect. C d.) You now remove an equal amount of electrons fromeach block, so the electric repulsion of the blocks cancels theirgravitational attraction to each other. (Note: You may assume themass of the blocks is not significantly reduced when removing theseelectrons-- why?) What is the net charge of each block now?1.72e-10 Correct: Your answer is correct. C How manyelectrons were removed from each block? Give a number, and thenalso express this as a percentage of the total number in the block.% Did your answers for this part depend on the distancebetween the blocks?
