JERSITY SHEET Q-9: A water jet with a cross-section area "a" impinges normally on a fixed plate with a velocity v What is the expression for the force exerted on the plate?p: density of water, g. gravitational acceleration nguer A) pav B) pav c) pava D) ? E) pgav2 DO Q-10: A solar collector measures 2 mx 1 m and has a capacity of 20*10m'. After exposure to sunlight for 1 hour, the mean temperature rise of the static water was 12 C. During this exposure, the solar insolation was 1000 W/m2. What is the efficiency of the solar energy collector under these conditions I cal=4,23 Swatar=103 kg C water= 103 cal m3 14% 10% A) B) C) D 12% 8% 16% EESEEEEEEEEEEEEEEEEEEEEEEEEEEEE me)