[单选题]
n airplane in straight level flight experiencaqi r98t :npfum-2suk c8r19ces0e 7eyx4tab7w a lift force $L$ that is proportional to the speed of the plane and is perpendicular to the axis of the wings and as shown in diagram.
On a banked turn at the same speed, the wings make an angle $θ$ with the horizontal.
Which of the following gives the centripetal force on the airplane?
