One way to sterilize food products such as meats and poultry is to irradiate them with a beam of high-energy electrons. In one food plant, the electrons in the beam have an energy of 10 MeV and the beam current is 0.30 mA. 7000 J of electron energy must be deposited in a 1 kg package of meat to properly sterilize it. How long should the beam be turned on to deposit this energy?