A4-kg block is connected by means of a massless rope to a 2-kg block as shown in the figure. complete the following statement: if the 4-kg block is to begin sliding, the coefficient of static friction between the 4-kg block and the surface must be

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?