9)
maximum height of rockets
half-filled three-quarters filled full
2-liter bottle 18m 21m 17m
1-liter bottle 12m 15m 20m
0.5-liter bottle 10m 12m 14m
plastic soda bottles are hooked up to a launcher. the launcher uses the water pressure to propel the rocket upward. what combination yields greatest height?
a) a full 2-liter bottle
b) a full 1-liter bottle.
c) a three-quarter full 1-liter bottle
d) a three-quarter full 2-liter bottle

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?