Final answer:
An operator should adhere to safety practices when leaving a suddenly energized crane, such as working with one hand to prevent electric shock. The total work done by a crane while lifting materials can be calculated by integrating the variable force over the distance lifted.
Step-by-step explanation:
It is advised for an operator who needs to leave a suddenly energized crane to follow safety protocols meticulously. Due to the high amount of energy involved in crane operations, there is a risk of electrical hazards like sparks occurring if the current is unexpectedly cut off. Safety practices such as working with one hand and keeping the other in your pocket help reduce the risk of completing an electrical circuit through the body, which can result in electric shock.
Furthermore, calculating the total work done by a crane during lifting involves integrating the force it applies over the distance through which it lifts the construction materials. When the force varies linearly, as described, this would typically involve calculating the area under the force-distance graph to find the work done.