Which question requires the collection of data to answer it? A. Should dolphins be trained for military uses?

B. Do dolphins make good pets?

C. Are dolphins cuter than porpoises?

D. How many hours a day do dolphins sleep?

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?

If you put a helium-filled balloon in the refrigerator, what will happen?

Achild has maximum walking speed of 1.6 m/s. what is the length of the child's legs? 0.26 m