20 points total halp the same force is applied to two skateboards. one rolls across the room and the other moves a few feet and comes to a stop. where was there more work done?

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

Which is the most accurate name for the covalent compound p2o3?

The resistance of 100 w bulb is less than resistance of 40 w bulb. explain the reason.