The drawing shows two crates that are connected by a steel wire that passes over a pulley. The unstretched length of the wire is 1.70 m, and its cross-sectional area is 1.25 10-5 m2. The pulley is frictionless and massless. When the crates are accelerating, determine the change in length of the wire. Ignore the mass of the wire.

 The change in length of the wire is= 8.613*10⁻⁷ m

Explanation:

                        The formula for Young's Modulus = Stress/ Strain

                                                      where x represents the change in length.

Rearranging the equation and making F/A the subject of the formula gives us            

The use of area is not required as we have assumed the the force of Atmosphere is being applied on the crates which means

                                                    F/A = Atmospheric Pressure

                                                    1 atm = 101325 Pa

now solve:

                                                     101325 = (2.10*10¹¹ Pa) * (x/1.7)

Therefore, x= 8.613*10⁻⁷ m

grav forces affect all objects magnetic forces affect magnetic objects and electric currents

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