Arock is shot from a catapult at the top of a mountain a height h above a level plain below. the rock is fired at an angle θ above the horizontal and with an initial vi.(a)find a symbolic expression in terms of the variables vi, g, and θ for the time at which the rock reaches its maximum height.

Consider a u-tube whose arms are open to the atmosphere. now equal volumes of water and light oil (ρ = 49.3 lbm/ft3) are poured from different arms. a person blows from the oil side of the u-tube until the contact surface of the two fluids moves to the bottom of the u-tube, and therefore, the liquid levels in the two arms are the same. if the fluid height in each arm is 30 in, determine the gage pressure exerted by the person on the oil by blowing.