Identify the parts of the wave below. ! i need it quite soon!

What are two different ways you could find the value of a? explain these methods.

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

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.