What is the best definition for friction? question 2 options: the heat produced from various objects how fast an object will slide on another object the force that allows objects to slide the force that opposes motion when two surfaces are in contact

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

How heavy is thanos? a) 3000 lbs b) all of it c) the price of tea in china d) heavy enough

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?