Using the image from the previous question: In which class of levers shown is mechanical advantage always greater than 1?A. First classe, Second classC. Third class D. You cannot have a mechanical advantage
greater than 1. *

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

One form of energy can be another type of energy. a. created to form b. transformed into c. destroyed and then created to form