A charged particle moves in a straight line through a particular region of space. Could there be a nonzero magnetic field in this region?

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.

What does si stand for,when referring to a system of measurement

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in