Light from a monochromatic source shines through a double slit onto a screen 5.00 m away. the slits are 0.180 mm apart. the dark bands on the screen are measured to be 1.70 cm apart. what is the wavelength of the incident light? (a) 612 nm (b) 457 nm (c) 306 nm (d) 392 nm

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Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

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.