You swing a bucket full of water in a vertical circle at the end of a rope. The mass of the bucket plus the water is 1.0 kg. The center of mass of the bucket plus the water moves in a circle of radius 0.6 m. At the instant that the bucket is at the top of the circle, the speed of the bucket is 7.0 m/s. What is the tension in the rope at this instant? N

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?