A car travels over a hill at constant speed. If the radius of the hill is 30 meters, at what speed would the centripetal force equal the force of gravity

What is work? how much work is done to move an object 0 meters?

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

Light that is polarized along the vertical direction is incident on a sheet of polarizing material. only 96% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. no light passes through the second sheet. what angle does the transmission axis of the second sheet make with the vertical?