An infinitely long line of charge has linear charge density 5.00×10−12c/m. a proton (mass 1.67×10−27 kg, charge +1.60×10−19
c) is 18.0 cm from the line and moving directly toward the line at 3.20×103m/s.
(a) calculate the proton's initial kinetic energy.
(b) how close does the proton get to the line of charge?

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano.the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? positive force → balanced force → negative force negative force → balanced force → positive force positive force → unbalanced force → negative force negative force → unbalanced force → positive force