Molten iron fills a mould, wich has a volume of 200 cm3.Calculate the volume when the iron cools and solidifies.

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?

Which characteristics can be used to differentiate star systems? check all that apply.

Compare and contrast refraction of light and sound will give brainliest