Which type of alternate air source does not necessarily require the donor to give up his primary second stage? Technical diving configuration. Alternate-air-source inflator. Conventional alternate-air-source second stage. None of the above

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.