Question

Oliver is designing a new children’s slide to increase the speed at which a child can descend. His first design involved steel because it is a very strong material that can also be smooth. He found this was not a good option after all. Which explanation most logically explains why the steel was not optimal for this project?
A) Steel becomes too hot in the sun and can burn the children.
B) Steel is a composite material, and these rarely work well when building prototypes.
C) Steel is too malleable and therefore not sturdy enough.
D) Steel is an inorganic material, and these are rarely efficient.

Answer 1

Answer:

The correct option is;

A) Steel becomes too hot in the Sun and can burn the children

Explanation:

The properties of steel includes;

Low specific heat capacity, high thermal and electrical toughness, high hardness, high tensile strength, high yield strength, appreciable elongation, high fatigue strength, can easily corrode, high malleability and ability to creep

Therefore, due to the low specific heat capacity, which is 0.511 J/(g·°C) and high conductivity of steel which is about 32 W/(m·k), the temperature of the steel can rapidly rise and the hot steel surface can readily conduct the heat, (due to the temperature difference) to other bodies that come in contact