A telephone lineman is told to stretch the wire between two poles so the poles exert an 800N force on the wire. As the lineman does not have a scale to measure forces, he decides to measure the speed of a pulse created in the wire when he hits it with a wrench. The pulse travels 60m from one pole to the other and back again in 2.6s. The 60m wire has a mass of 15kg.

Should the wire be tightened or loosened?

A. Loosened
B. Tightened

f = 532.46 N

Explanation:

V = √(f / u) is the formula that describe the relationship between the speed of a pulse moving on a rope, and the force being exerted on the rope.

u = m / L, such that

u = 15 / 60

u = 0.25 kg/m

We calculate the speed of the pulse

v = distance / time

v = (2 * 60) / 2.6

v = 46.15 m/s

v = √(f / u)

F = uv²,

F = 0.25 * 46.15 * 46.15

F = 532.56 N

The rope should be tightened because the force in the wire is less than the required force.

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

what was the answer?