Solve problems $3,4,$ and $5.$

The hydraulic dredge shown below is used to dredge sand from a river bottom. Estimate the thrust needed from the propeller to hold the boat stationary. Assume the specific gravity of the sand$/$water mixture is $SG=1\mathrm{.}4.$

A horizontal, circular cross$-$sectional jet of air having a diameter of $6$ in strikes a conical deflector, as shorn below. A horizontal anchoring force of $5$ lb is required to hold the cone in place. Estimate the nozzle flowrate in $f\frac{t^3}{s}.$ The magnitude of the velocity of the air and the density of the air remains constant $($see Table $1\mathrm{.}7$ for density of air$).$

The plate shown below is $0\mathrm{.}5$ m wide $($into the paper$).$ Calculate the velocity of the water jet required to hold the plate upright. Hint: Return of Module $2!$