$7\mathrm{.}1$ What suggestions do you have for improving the apparatus? $7\mathrm{.}2$ What would be the effect of the calculated value of the efficiency of the following systematic errors of measurement? a$.$ Jockey weight in error by $0\mathrm{.}001$kg b$.$ Distance form center of vane to pivot of lever in error by $1$mm c$.$ Diameter of water jet emerging from nozzle $0\mathrm{.}1$mm different from nozzle diameter. $7\mathrm{.}3$ It has been assured that the velocity in the jet is uniform over its cross$-$section. How is the momentum in the jet affected if this is not so$?$ Consider for example, a jet of cross$-$sectional area, a in which the velocity is $0\mathrm{.}5$uo over half of the area and $1\mathrm{.}5$uo over the other half. The discharge is the same as if the velocity were uo over the whole, namely: Show that the rate of delivery of momentum in the jet is $1\mathrm{.}25$Wuo, that is$,25\%$ greater than if the velocity were uniform over the cross$-$section. $7\mathrm{.}4$ What would be the effect on the calculated force on the flat plate, if the jet were assumed to leave the plate not absolutely horizontally, but inclined upward at an angle of $1$o $?$