A car engine supplies 2.0 × 10^3 joules of energy during the 10 seconds it takes to accelerate the car along a horizontal surface. What is the average power developed by the car engine while it is accelerating?

A. they hold atoms  together with a molecule.its a force that exist between molecules. hope this .

Which of the following are risk factors for emphysema ? correct answer : a and and c          good luck and have a nice benevolentpuppy day! : )

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.