a car accerlates from (rest zero) speed up to a 30 speed m/s in 12 seconds calculate the acceleration

What is the relationship of air masses and the temperature of oceans?

What are transitions between a liquid and a solid called? identify which way they are transitioning

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?