What laws did dalton propose

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?

Give the orbital configuration of the phosphorus (p) atom.