An aeroplane is moving at a constant speed in a straight line at an angle $θ$ to the horizontal. Four forces act on the aeroplane: thrust force $T$, weight $W$, lift force L and resistive force $R$.
Which two equations must be correct?
\( L = W \cos \theta \) and \( T = R + W \sin \theta \)
2 )
\( L = W \sin \theta \) and \( T = R + W \cos \theta \)
3 )
\( L = W \cos \theta \) and \( T = R - W \sin \theta \)
4 )
\( L = W \sin \theta \) and \( T = R - W \cos \theta \)
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