Final answer:
Without the picture showing the pulley system, there is not enough information to determine the effort needed to lift the 300-pound load. The answer choice is (d) Not enough information provided because the mechanical advantage of the system cannot be established.
Step-by-step explanation:
To determine the effort needed to lift a 300-pound load, we typically refer to the mechanical advantage (MA) provided by a machine, such as a pulley system. The provided options suggest it might be a simple machine with varying degrees of mechanical advantage. Since there's no picture displayed above, we cannot accurately answer whether the effort needed is (a) 150 pounds, (b) 300 pounds, or (c) 450 pounds without additional information. However, if the pulley system were in perfect condition (ignoring friction and pulley weight) and designed to provide an MA of 2, the effort would be half of the load, or 150 pounds. On the other hand, if no mechanical advantage is provided, the effort would be equal to the weight of the load itself, which is 300 pounds. The correct choice must be (d) Not enough information provided, as we lack the visual of the system in question and therefore cannot determine the mechanical advantage the question seeks to calculate.