Atightrope walker wants to know the tension used to support the rope that is suspended between two poles. the rope is 18 m long and has a mass of 12 kg. she creates a wave pulse by tapping on one end of the rope and measures that it takes 2.7 s for the pulse to travel from one pole to the other. what is the tension in the rope?

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?