Question

A trolley wire weighs 1.2 kg per metre length solution

Answer 1

Answer:

Step-by-step explanation:

A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 metres apart. If the horizontal tension is 1500 kg find the dip in the middle of the span?

answer===The dip will be approximately 40 cm. I assumed that it is a copper wire, 150 mmsq cross section area, tensile modulus (Young’s modulus) = 117GPa. Its 10 m long each side will increase its length 0.8 cm under 1500kG force. This will give 40cm dip.