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Idiot_1
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Homework Statement
Two equal uniform rods AB & AC of weight W & length 2a are jointed smoothly at A. Two rods are kept freely under equilibrium over a smooth circular cylinder of radius r where axis of cylinder to be horizontal. If both rods inclined at an angle ɵ to the horizontal. Show that a cos3ɵ.cosecɵ = r
Homework Equations
Sin rule
[tex]\frac{A}{SinA}[/tex]=[tex]\frac{B}{SinB}[/tex] = [tex]\frac{C}{SinC}[/tex]
Cosine rule
a2 = b2 + c2 + 2bc cosA
The Attempt at a Solution
Applying cosine rule
r2 = r2 + 4a2 + 4ra cos(90-ɵ)
4a2 = 4ra sinɵ
a = r sinɵ
r = a cosecɵ
i got this answer, help me to reach above answer