A piece of hot metal 120 °C is placed into a calorimeter that contains 40 ml of water at 22 °C After heat exchange is complete the temperature of water is 28 °C What is the mass of the metal? (Assume that no heat is lost to the surroundings). specific heat of metal: 0.126 °C specific heat of water: 4.184 J°C 121 density of water. 1 g ml

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?