You hold one end of a string that is attached to a wall by its other end. the string has a linear mass density of 0.067 kg/m. you raise your end briskly at 11 m/s for 0.016 s, creating a transverse wave that moves at 37 m/s . part a how much work did you do on the string? express your answer with the appropriate units. w w = nothing nothing request answer part b what is the wave's energy? express your answer with the appropriate units.

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?