One Saturday morning, a family drives east from Olds to Trochu, a distance of 59 km. Then they drive west to Sundre, a distance of 97 km. What distance does the family travel? Show your work. (1 mark)
What is the displacement (magnitude and direction) of the family? Show your work.

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?