by $C_D=\frac{24}{R}e,$ where $Re$ is the Reynolds number.

b$)$ I:$400$ model is constructed to stitly tides. What longth of time in the model corresponds to a day in the prototype? Suppose the model could be trunsported to the moon and tested there. What then would be the time relationship between the model and protolype? Given, $\text{'}$g$\text{'}$ of earth $=6$ times $\text{'}$g$\text{'}$ of moon.

c$)$ Sphere of diameter d and density ${}_n$ settles at a terminal velocity V in a liquid of