Final answer:
The statement regarding different paths leading to different displacements is false; both persons have the same displacement. High-voltage wires are held by insulators but are not typically insulated themselves, making the statement false. The specific force applied on a ramp depends on more than just its dimensions; therefore, the claim about the force being exactly 100 N is false.
Step-by-step explanation:
Displacement and High-Voltage Wires True or False Questions
When examining the displacement of two persons moving in different sequences,
we consider the fact that displacement is a vector quantity, which means it has both a magnitude and a direction. The first person walks 2 blocks east and then 5 blocks north.
The second person walks 5 blocks north and then 2 blocks east. Since both
end up at the same point regardless of path taken, their displacements would be identical,
therefore, the statement that the displacement of the first person will be more than the displacement of the second person is false.
Concerning the high-voltage wires, it is true that they are held up by
insulating connectors attached to metal-frame towers. However, the wires themselves
are not typically insulated because they are high in the air, out of reach, and free
from contact with objects. Thus, the wires are not wrapped in insulating material, and the statement is false.
Force and Ramp True or False Question
A boy pushed a box with a weight of 300 N up a 1.0 m high and 3.0 m long ramp. To determine the force he exerted on the box we would need to calculate the mechanical advantage of the ramp and consider factors such as friction. Simply using the dimensions of the ramp does not provide enough information to deduce the exact force applied. Therefore, the statement that he must have been pushing with a force of exactly 100 N is false.
Wave Phenomena True or False Questions
A pulse wave is a single disturbance that moves through a medium from one point to another. When a pebble is dropped in water, it creates a series of circular waves emanating outward from the point of impact, which can be considered as pulse waves originating from the impact point. So, the statement is true.
The phenomenon of wave interference comes in two forms: constructive interference, where waves add together, and destructive interference, where waves cancel each other out. This means the statement that the two types of interference are constructive and destructive interferences is true.