When comparing and contrasting EM and mechanical waves, which is true.

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

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.

The heliocentric and the geocentric models of the solar system included these central principles