] Light of wavelength 500.0 nm in air falls at normal incidence on an oil film that is 850.0 nm thick. The oil is floating on a water layer. The refractive index of water is 1.33, and that of the oil is 1.40. You want to add oil so that light reflected from the oil film will be canceled. What is the minimum thickness of oil film you need to add

gas and liquid

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach

the moving of the box is a result of centripetal force. think of that  as a car or a truck in this case creates a turn, the force of friction performing upon the turned wheels of the car runs centripetal force obligatory for circular motion for the things inside it.