21. A pulley is _____________. * 1 point A. A bar used to lift heavy loads B. A wheel with a groove for a rope C. Made of two inclined planes D. A lever with an arm and a fulcrum 22. Which simple machine is used in a variety of ways to lift loads, apply forces, and to transmit power? * 1 point A. Lever B. Pulley C. Wedge D. Screw 23. Which type of pulley allows you to raise the flag? * 1 point A. Fixed Pulley B. Movable Pulley C. Block and Tackle Pulley D. Both Fixed and Movable Pulley 24. All of it are functions and uses of pulley, EXCEPT ______ * 1 point A. Used to lift things B. Used to transport people or things C. Used to provide power from one shaft to another D. Used to separate two objects or portions of an object 25. In what part of the wheel and axle do you apply the effort? * 1 point A. wheel B. Axle C. Pitch D. Fulcrum​