List 3 machines you can make to reduce the amount of energy you use in your activities (or work)

no sign of dia of fuel cell

we need to know the time interval during which the force acts. impulse of force = momentum change

your answer is, orbit around the nucleus

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.