Which statement correctly describes protons? they have no charge and are present in the nucleus of an atom. they have a negative charge and travel around the nucleus of an atom. they have a positive charge and travel around the nucleus of an atom. they have a positive charge and are present in the nucleus of an atom along with the neutrons. nextreset

Air flows upward in the wick of a lantern because of the liquid property called

If steel is more dense that lake water, why can a boat float

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.