7. At a different point on the hill, the skateboarder above has 900 J of potential energy. According to the law of conservation of energy, how much kinetic energy will the
skateboarder have at this point?
A. 600 )
B. 900 J
C. 1500 J
D. 2400 J

Because its reliable.   there is no pollution  the chances of a radiation leak is low

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.

490 n  f=125n a=2.5m/s2

The anwser is: wave a has a greater pitch and frequency.