The communications system has evolved greatly in the last 20 years. People are now able to communicate more quickly and easily using computers, cellular phones, and other devices. Identify one possible side effect this change may have. Explain your answer. Identify one physical or social system that would be affected by an increase in the average age of Canada’s population. Describe how this change would affect the system.

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg.how much energy e must be supplied to the device? express your answer in joules.