Final answer:
True, all hoisting operations must be pre-planned to not hoist loads over workers. High-voltage wires are held by insulating connectors but are not wrapped in an insulating material. The force needed to push a box up a ramp cannot be determined solely by the ramp's dimensions.
Step-by-step explanation:
All hoisting operations must be pre-planned to ensure that loads are not hoisted over workers. The answer to this statement is A) True. Hoisting operations involve the lifting and moving of heavy loads with equipment such as cranes. Safety regulations typically require careful planning of these operations to prevent loads from being hoisted over areas where workers are present to minimize the risk of accidents and injuries. Having a pre-planned path for the load, establishing safety protocols, and designating clear zones where no workers should be present during hoisting are all crucial steps in ensuring a safe working environment.
Regarding the other reference questions, the answer to the statement about high-voltage wires is B) False. The high-voltage wires are indeed supported by insulating connectors to prevent electrical currents from going to the ground; however, these wires are not typically wrapped in an insulating material because they are suspended in the air where the risk of contact with conductive materials is minimal. Insulating material would be superfluous and impractical due to the wires' exposure to the elements and the distances they cover.
For the question about the boy pushing a box up a ramp, the answer is B) False. The force needed to push the box cannot be determined simply by the height and length of the ramp without accounting for other factors like friction and the efficiency of the ramp's angle. The work done on the box is determined by the gravitational force (weight) and the height lifted, but the actual force exerted by the boy would depend on these additional variables.