Jane and Ochan are sitting in a canoe. Ideally, Ochan wants to know Jane’s mass, but he won’t tell her. He tricks her into switching positions with him in the canoe.

After the switch, he notices that the canoe moves 2 feet. He knows that his mass is 100 kg.

If the canoe is 12 feet long and has a mass of 40 kg, what is Jane’s mass? (Assume that there

are no external forces on the system).

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?