7. state hooke’s law. a spring will stretch 12 cm when a 250-g mass is hung on it. if the 250-g mass is hung on two identical springs, hung sided by side, and both support the 250-g mass, how much will each spring stretch. explain.

Hooke's law states that the amount of the stretch in a spring is directly proportional to the amount of force added to it. In the second scenario, there are already two springs and each of them will have to support only half of the downward force of the material attached to it. Therefore, the stretch in each of the spring should only be 6 cm. 

B, if it was a lower watt she could put it in for her normal time and not burn it

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.