A rectangular water tank is being towed up a hillside at an angle of alpha =20 deg with the horizontal. The top water surface is exposed to the atmosphere. If the tank accelerates at 5 m^2/s in the direction of motion, what is the angle theta between the water surface and the horizontal? The acceleration of gravity g=9.81 m/s^2. Note that the slope of the top surface d zs/dx = -tan(theta)
