A hiker's trip consists of three segments. Path A is 8.0 km long heading 60.0⁰ north of east. Path B is 7.0 km long in a direction due east. Path C is 4.0 km long heading 315⁰ counterclockwise from east. A. Graphically add the hiker's displacements in the order A, B,C B. Graphically add the hiker's displacements in the order C, B,A C. What can you conclude about the resulting displacements?

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?