Answer: The Youngs modulus is higher, so it stretches less and resists deformation better.
- A The mass density of steel is considerably lower than that of copper of equal volume
- B The Youngs modulus is higher, so it stretches less and resists deformation better
- C The bulk modulus of steel under compression is lower than that of copper
- D Steel happens to have a noticeably higher Poissons ratio than copper does
Correct answer: B. The Youngs modulus is higher, so it stretches less and resists deformation better
Explanation: Steel has a higher Youngs modulus than copper, meaning it deforms (stretches) less under the same stress, making it more suitable for load-bearing applications like cables and bridges.
A typical stress-strain curve: the initial straight line (Hooke's Law region, slope = Young's modulus) ends at the elastic limit; beyond the yield point, deformation becomes permanent, peaking at the ultimate tensile strength before the wire finally fractures.
Concept context
Stress, strain, Hookes law, and the elastic moduli that describe how solids deform and recover under load.