How much force is required to move a box that weighs 500N if the coefficient of friction between the box and the surface is 0.4? Show your work and include units.

What is the power rating of the lightbulb if 3.0 a flow through it when connected to a 15 v battery

If the specific heat of a metal is 0.850 j/g °c, what is its atomic weight?

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?