Any two difference between short sightedness and long sightednes

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

Can someone me with 3 and 4 plz. this is for masteries test.

How is the use of hydroelectric power related to the sun