For Problem $1,$ fill the blanks with appropriate equations. Please. Refer to the ACI Sections $1920\mathrm{.}2\mathrm{.}2\mathrm{.}2$ if needed.

$(5$ pts $)$ Modulus of elasticity, $E_s$ for nonprestressed reinforcement shall be permitted to be taken as $(,)$ or Section $20\mathrm{.}2\mathrm{.}2\mathrm{.}2]$

$(5$ pts $)$ For Grade $60$ reinforcement, what is the yield strain of the reinforcement, ${}_y?$

$[$ACI Section $20\mathrm{.}2\mathrm{.}2\mathrm{.}1$ and R$20\mathrm{.}2\mathrm{.}2\mathrm{.}1]$

$[$Hint: The yield strength $f_y$ of Grade $60$ reinforcement is $60$ ksi $]$

$(5$ pts$)$ For Grade $40$ reinforcement, what is the yield strain of the reinforcement, ${}_y?$

$[$ACI Section $20\mathrm{.}2\mathrm{.}2\mathrm{.}1$ and R$20\mathrm{.}2\mathrm{.}2\mathrm{.}1]$

$[$Hint: The yield strength $f_y$ of Grade $40$ reinforcement is $40$ ksi $]$

$(5$ pts$)$ For Grade $60$ reinforcement, what is the stress in the reinforcement, $f_s$ when the strain of reinforcement ${}_s$ is $0\mathrm{.}0015?$

$[$ACI Section $20\mathrm{.}2\mathrm{.}2\mathrm{.}1$ and R$20\mathrm{.}2\mathrm{.}2\mathrm{.}1]$

$(5$ pts$)$ For Grade $60$ reinforcement, what is the stress in the reinforcement, $f_s$ when the strain of reinforcement ${}_s$ is $0\mathrm{.}004?$

$[$ACI Section $20\mathrm{.}2\mathrm{.}2\mathrm{.}1$ and R$20\mathrm{.}2\mathrm{.}2\mathrm{.}1]$