QUESTION $19$

Using $Re=v\frac{l}{},$ determine the prototype speed $(v_p)$ in air in $\frac{m}{s}$ for a $1$:$6$ scale up if the model speed $(v_m)$ in water is $28\mathrm{.}1\frac{m}{s}.$

Data ${}_{\text{a}\text{i}\text{r}}=1\mathrm{.}225k\frac{g}{m^3},{}_{\text{a}\text{i}\text{r}}=1\mathrm{.}789*{10}^{-5}k\frac{g}{m}.s,{}_{\text{w}\text{a}\text{t}\text{e}\text{r}}=999\mathrm{.}1k\frac{g}{m^3},{}_{\text{w}\text{a}\text{t}\text{e}\text{r}}=1\mathrm{.}139*{10}^{-3}k\frac{g}{m}.s.$

a$.60\mathrm{.}0$

b$.2160$

c$.13\mathrm{.}2$

d$.360$