Two warships were moving toward each other in the same straight line at 50 km/h and 89 km/h respectively. One of the ships fired a shell toward the other when the distance to it was 4.2 km. Given that the shell's horizontal velocity relative to the first ship was 211 km/h, how long did it take for the shell to hit the second ship?

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.