You have a tube that is open at one end and closed at the other that has a fundamental frequency with a wavelength of 0.90 m. You want to make the tube longer and still have that wavelength as one of the harmonics, but you want to lengthen it as little as possible. How much longer should you make it

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