An example of mechanical energy being converted into heat energy is

a)
the sun.

b)
a generator.

c)
a snickers bar.

d)
rubbing your hands together.

water is at 50° c, and energy is removed from the water until it is at -10° c (while maintaining a constant pressure of 760 mm), describe the phase change of the water.

a)
solid water to water vapor

b)
solid water to liquid water

c)
liquid water to solid water

d)
liquid water to water vapor