Physics Stress and Strain

Question

a piano tuner exerted 1500 N in stretching a 0.5 m long steel piano wire with a cross-sectional area of 0.15 cm^2. by how much does this force lengthen the wire?

Answer 1

E = Young's modulus for the steel piano wire (look it up)

 

A = cross sectional area of wire = 0.15 cm² (you may want to work with m²)

 

L = original length of wire = 0.5 m

 

F = applied load = 1500 N

 

ΔL = amount the wire is lengthened = ?

 

Use the relation

 

ΔL = FL/(AE)

 

Plug in the numbers in appropriate units after you find E from tables.