Monochromatic light falls on a slit that is 2.30×10−3mm wide. part a if the angle between the first dark fringes on either side of the central maximum is 34.0 ∘ (dark fringe to dark fringe), what is the wavelength of the light used?

Suppose while hauling rocks, you accidentally drop one. it breaks apart in flat, planar sections. what type of rock did you just drop? 20 points

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?