How much work is performed when 17 newtons are moved 3 meters?

Which of the following is an example of units for speed

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

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?