Block B has mass m and is released from rest when it is on top of wedge A, which has a mass 3 m. Determine the tension in cord CD needed to hold the wedge from moving while B is sliding down A. Neglect friction :
Answer & explanation
Correct answer: option 3
\(T = N \sin {\theta} \text{ and} N = mg \cos {\theta}\)
\(T = mg \cos {\theta} \sin {\theta}\)
\(T = \frac{mg}{2} \sin {2\theta}\)