PRACTICE / Young modulus experiment

Read stiffness from extension data

A uniform wire has original length 2.0 m and area 1.0 mm². Its extension readings are 0.10, 0.20 and 0.30 mm at tensile forces 10, 20 and 30 N.

Find Young’s modulus.

1. A$2.0\times10^5\ \mathrm{Pa}$
2. B$5.0\times10^{-12}\ \mathrm{Pa}$
3. C$2.0\times10^{11}\ \mathrm{Pa}$
4. D$2.0\times10^8\ \mathrm{Pa}$

Try it on paper first. Free sample problems in every collection include the complete reasoning: find one in this collection →