Hello,
I've worked through the free-body diagram to compute the answer:
tan(𝜃) = 0.67
𝜃 = arctan(0.67) = 33.822...
The answer is supposed to be approximately 42. Yet, tan(42) is not 0.67, is the suggested answer wrong?
Since the airplane is flying at a constant speed, then the lift force equals the weight of the airplane. This means that the lift force prior to acceleration is the mass * gravity constant = 29400 N.
When the airplane increases horizontal speed, the lift force increases to 30 kN. This means...