JAMB - Physics (1997 - No. 43)
For what value of \(\theta\) are the forces in the diagram above in equilibrium
\( 15^{\circ} \)
\( 30^{\circ} \)
\( 45^{\circ} \)
\( 60^{\circ} \)
説明
So the diagram in the question is compressed to the one above.
From the diagram: Cos\(\theta\) = \(\frac{6}{12}\) = \(\frac{1}{2}\)
\(\theta\) = Cos\(^{-1}\)(0.5) = 60º