A system of pulleys allows a mechanic to lift an 1800 N engine. If the mechanic exerts a force of 600 N on the pulley system, what is the
mechanical advantage of the machine?

the answer is d. 4

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molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.