What is potential energy called that is associated with objects that can be stretched

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

Write down two additional questions about earth's magnetic field that will make your presentation more informative.

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?